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===Ages of equal or variable lengths===
Astrologers use many ways to divide the [[Great Year]] into twelve astrological ages. There are two popular methods. One method is to divide the Great Year into twelve astrological ages of approximately equal lengths of around 2156 years per age based on the [[Equinox (celestial coordinates)|vernal equinox]] (also known as ''vernal point'') moving through the [[sidereal zodiac]].{{sfnp|Carter|19731951|p=75}} Another method is to significantly vary the duration of each astrological age based on the passage of the vernal equinox measured against the actual [[zodiacal constellations]].{{sfnp|Campion|2004|p=489}} Each of those twelve sections of the Great Year can be called either an astrological age, Precessional Age, or a Great Month.{{sfnp|Moore|Douglas|1971|p=676}}
 
The method based on the zodiacal constellations has a flaw in that from the reckoning of classical-era astronomer/astrologers like [[Claudius Ptolemy]], many constellations overlap, a problem only eliminated in the past 200 years by the adoption of official constellation boundaries. For example, by 2700 CE the vernal point will have moved into Aquarius, but from a classical-era point of view, the vernal point will also point to Pisces due to the pre-boundary overlap.{{sfnp|Grasse|2002|p=263}}
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==History==
===Hipparchus and the discovery of the precession of the equinoxes===
[[Hipparchus of Nicaea]] (c. 190–120 BCE) is often credited with the discovery of the precession of the equinoxes, a fundamental astronomical phenomenon that plays a crucial role in the concept of astrological ages. Precession refers to the gradual shift in the orientation of Earth's axis of rotation, which causes the positions of the equinoxes to move slowly westward along the ecliptic, completing a full cycle approximately every 26,000 years.{{sfnp|Swerdlow|2014}}
 
Hipparchus made this discovery while comparing his observations of the positions of stars with records from earlier astronomers, particularly those from Babylon. He noticed that the positions of certain fixed stars had shifted relative to the equinoxes over time, an observation that could not be explained by the prevailing astronomical models of his time. In his work, Hipparchus noted that the position of the vernal equinox had shifted by about 2° relative to the stars over the course of a century, which implied a slow, continuous motion of the celestial sphere.{{sfnp|Evans|1998}}
 
This discovery was groundbreaking because it revealed that the celestial sphere was not as fixed as previously thought. Hipparchus' calculation of the precession rate was remarkably close to the modern value, estimating it at roughly 1° per century, which is only slightly different from the current measurement of approximately 1° every 72 years.{{sfnp|Toomer|1998}}
 
Hipparchus' findings were later documented by the Alexandrian astronomer [[Claudius Ptolemy]] in his seminal work, the ''[[Almagest]]'' (c. 150 CE), where he further refined and expanded upon Hipparchus' observations. Ptolemy's ''Almagest'' became the standard reference for astronomers for many centuries and solidified the concept of precession in the astronomical canon.{{sfnp|Toomer|1998}}
 
The recognition of precession had profound implications for astrology, particularly in the development of the concept of astrological ages. As the equinoxes precess through the zodiac, they mark the beginning and end of these ages, each lasting roughly 2,160 years, based on the 12 zodiacal constellations. The shift from one age to another is thought to bring about significant cultural and spiritual changes, a belief that has influenced astrological thought since antiquity.{{sfnmp|1a1=Evans|1y=1998|2a1=Swerdlow|2y=2014}}
 
===Post-Hipparchus===
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Hipparchus' discovery of precession of the equinoxes may have created the [[Mithraic Mysteries]], colloquially also known as [[Mithraism]], a 1st – 4th century neo-Platonic [[Greco-Roman mysteries|mystery cult]] of the Roman god Mithras. The near-total lack of written descriptions or scripture necessitates a reconstruction of beliefs and practices from the archaeological evidence, such as that found in Mithraic temples (in modern times called ''[[mithraeum|mithraea]]''), which were real or artificial caves representing the cosmos. Until the 1970s most scholars followed [[Franz Cumont]] in identifying Mithras as a continuation of the Persian god [[Mithra]]. Cumont's continuity hypothesis led him to believe that the astrological component was a late and unimportant accretion.{{cn|date=August 2024}}
 
Cumont's views are no longer followed. Today, the cult and its beliefs are recognized as a synthesis of late-classical Greco-Roman thought, with an astrological component even more astrology-centric than Roman beliefs generally were during the early Roman Empire. The details remain debated.<ref name=Mithraism>{{cite book sfnp|last=Ulansey |first=David |year=1991 |title=Mithraism: The Cosmic Mysteries of Mithras |publisher=Mysterium |url=http://www.mysterium.com/mithras.html}}</ref>
 
As far as [[axial precession (astronomy)|axial precession]] is concerned, one scholar of Mithraism, David Ulansey,<ref name=Mithraism/> has interpreted Mithras as a personification of the force responsible for precession. He argues that the cult was a religious response to Hipparchus's discovery of precession, which – from the ancient geocentric perspective – amounted to the discovery that the ''entire cosmos'' (i.e., the outermost [[celestial sphere]] of the fixed stars) was moving in a previously unknown way. Ulansey's analysis is based on the ''[[tauroctony]]'': the image of Mithras killing a bull that was placed at the center of every Mithraic temple. In the standard tauroctony, Mithras and the bull are accompanied by a ''dog'', a ''snake'', a ''raven'', a ''scorpion'' and two identical young men, with torches.{{cnsfnp|date=August 2024Ulansey|1991}}
 
According to Ulansey, the tauroctony is a schematic [[star chart]]. The bull is [[Taurus (constellation)|Taurus]], a constellation of the zodiac. In the astrological age that preceded the time of Hipparchus, the vernal equinox had taken place when the Sun was in the constellation of Taurus, and during that previous epoch the constellations of [[Canis Minor|Canis Minor (The Dog)]], [[Hydra (constellation)|Hydra (The Snake)]], [[Corvus (constellation)|Corvus (The Raven)]], and [[Scorpius|Scorpius (The Scorpion)]] – that is, the constellations that correspond to the animals depicted in the tauroctony – all lay on the celestial equator (the location of which is shifted by the precession) and thus had privileged positions in the sky during that epoch. Mithras himself represents the constellation [[Perseus (constellation)|Perseus]], which is located directly above Taurus the Bull: The same location occupied by Mithras in the tauroctony image. Mithras' killing of the Bull, by this reasoning, represented the power possessed by this new god to shift the entire cosmic structure, turning the cosmic sphere so that the location of the spring equinox left the constellation of Taurus (a transition symbolized by the killing of the Bull), and the Dog, Snake, Raven, and Scorpion likewise lost their privileged positions on the celestial equator.<ref name=Mithraism/>{{sfnp|Ulansey|1991}}
 
The [[iconography]] also contains two torch-bearing twins ([[Cautes and Cautopates]]) framing the bull-slaying image – one holding a torch pointing up and the other a torch pointing down. These torch-bearers are sometimes depicted with one of them (torch up) holding or associated with a Bull and a tree with leaves, and the other (torch down) holding or associated with a Scorpion and a tree with fruit. Ulansey interprets these torch-bearers as representing the spring equinox (torch up, tree with leaves, Bull) and the autumn equinox (torch down, tree with fruit, Scorpion) in Taurus and Scorpius respectively, which is where the equinoxes were located during the preceding "Age of Taurus" symbolized in the tauroctony as a whole.{{cn|date=August 2024}}
 
From this, Ulansey concludes that Mithraic iconography was an "astronomical code" whose secret was the existence of a new cosmic divinity, unknown to those outside the cult, whose fundamental attribute was his ability to shift the structure of the entire cosmos, and thereby to control the astrological forces believed at that time to determine human existence. That gave him the power to grant his devotees success during life and salvation after death (i.e., a safe journey through the planetary spheres and a subsequent immortal existence in the sphere of the stars).<ref name=Mithraism/>{{sfnp|Ulansey|1991}}
 
====Rate of precession====
Though the one degree per hundred years calculated for [[precession of the equinoxes]] as defined by [[Hipparchus]] and promulgated by [[Ptolemy]] was too slow, another rate of precession that was too fast also gained popularity in the 1st millennium AD. By the fourth century AD, Theon of [[Alexandria]]<ref>Pingree, David: Precession and Trepidation in Indian Astronomy before A.D. 1200. Journal for the History of Astronomy, Vol. 3, pp.&nbsp;27–35</ref> assumed a changing rate (trepidation) of one degree per 66 years.{{sfnp|Pingree|1972}} The tables of the Shah (Zij-i Shah)<ref>Pingree, David Edwin: "The Recovery of early Greek astronomy from India", Journal for the History of Astronomy, Bd. 7, 1976, S. 112</ref> originate in the sixth century, but are lost, but many later Arabic and Persian astronomers and astrologers refer to them and also use this value.{{cnsfnp|date=August 2024Pingree|1976}}
 
These later astronomers-astrologers or sources include: [[Al-Khwarizmi]], [[Zij al Sindhind]] or "Star Tables Based on the Indian Calculation Method"(c. 800); "Tabulae probatae" or "az-Zig al-mumtan" (c. 830); [[Al-Battani]], [[Albategnius]], al-Zij (c. 880); and al-Sufi, [[Azophi]] (c. 965); [[Al Biruni]] (973–1048), "al Canon al Masud" or "The Masʿūdic Canon"; Arabic fixed star catalogue of 1 October 1112 (ed. Paul Kunitzsch); and "Libros del Saber de Astronomía" by [[Alfonso X of Castile]] (1252–1284).<ref>Anna-Teresa Tymieniecka, "Astronomy and Civilization in the New Enlightenment: Passions of the Skies", Springer, p 96</ref>
 
====Anno Domini====
There exists evidence that the modern calendar developed by [[Dionysius Exiguus]] in the 6th century AD commencing with the birth of [[Jesus Christ]] at AD 1 was influenced by [[precession of the equinoxes]] and astrological ages. Dionysius' desire to replace Diocletian years (Diocletian persecuted Christians) with a calendar based on the incarnation of Christ was to prevent people from believing the imminent end of the world. At the time it was believed that the [[Resurrection]] and end of the world would occur 500 years after the birth of Jesus. The current [[Anno Mundi]] calendar theoretically commenced with the creation of the world based on information in the [[Old Testament]]. It was believed that based on the Anno Mundi calendar Jesus was born in the year 5500 (or 5500 years after the world was created) with the year 6000 of the Anno Mundi calendar marking the end of the world.<ref>{{sfnmp|1a1=Wallraff, Martin: Julius Africanus und die Christliche Weltchronik. Walter de Gruyter, 2006</ref><ref>|1y=2012|2a1=Mosshammer, Alden A.: The Easter Computus and the Origins of the Christian Era. Oxford University Press, |2y=2009, p. |2pp=254, p. 270, p. 328</ref>}}
 
Anno Mundi 6000 (approximately AD 500) was thus equated with the Second Coming of Christ and the end of the world.<ref>{{sfnp|Declercq, Georges: Anno Domini. The Origins of the Christian Era. Turnhout Belgium. |2000</ref>}} Since this date had already passed in the time of Dionysius, he therefore searched for a new end of the world at a later date. He was heavily influenced by ancient cosmology, in particular the doctrine of the [[Great Year]] that places a strong emphasis on planetary conjunctions. This doctrine says that when all the planets were in conjunction that this cosmic event would mark the end of the world. Dionysius accurately calculated that this conjunction would occur in May AD 2000. Dionysius then applied another astronomical timing mechanism based on [[precession of the equinoxes]]. Though incorrect, some oriental astronomers at the time believed that the precessional cycle was 24,000 years which included twelve astrological ages of 2,000 years each. Dionysius believed that if the planetary alignment marked the end of an age (i.e. the Pisces age), then the birth of Jesus Christ marked the beginning of the Age of Pisces 2,000 years earlier. He therefore deducted 2,000 years from the May 2000 conjunction to produce AD 1{{sfnp|Rothwangl|2003}} for the incarnation of Christ.{{sfnpsfnmp|1a1=Rothwangl|1y=2003}}{{sfnp|2a1=Rothwangl|2y=2010}}<ref>Astronomical Phenomena that Influenced the Compilation of Anno Domini. The Inspiration of Astronomical Phenomena. Volume 441.</ref><ref>The Last Day Calculation of Anno Domini. Proceedings of the SEAC conference Ljubljana 2012. To be published in Anthropological Notebooks, official journal of the Slovene Anthropological Society. 2013</ref>
 
====Mashallah ibn Athari====
The renowned Persian Jewish astronomer and astrologer Masha'Allah (c.740 – 815 CE) employed [[precession of the equinoxes]] for calculating the period "Era of the Flood" dated as 3360 BCE or 259 years before the Indian [[Kali Yuga]], believed to have commenced in 3101 BCE.<ref>Viator. Medieval and Renaissance Studies, University of California Press, {{sfnp|White|1970, Pp |p=149</ref>}}
 
====Giovanni Pico della Mirandola====
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In astrology, an astrological age has usually been defined by the constellation or superimposed [[sidereal zodiac]] in which the Sun actually appears at the vernal equinox. This is the method that [[Hipparchus]] appears to have applied around 127 BC when he calculated precession. Since each sign of the zodiac is composed of 30 degrees, each astrological age might be thought to last about 72 (years) × 30 (degrees) = about 2160 years.
 
This means the Sun crosses the equator at the vernal equinox moving backward against the fixed stars from one year to the next at the rate of one degree in seventy-two years, one constellation (on average) in about 2148 years, and the whole twelve signs in about 25,772 years,<ref name="demonstrations.wolfram.com">{{Cite web |title=Precession of the Earth's Axis – Wolfram Demonstrations Project |url=http://demonstrations.wolfram.com/PrecessionOfTheEarthsAxis/ |access-date=2019-02-10 |website=demonstrations.wolfram.com |language=en}}</ref> sometimes called a [[Great Year|Platonic Year]]. However the length of the ages are decreasing with time as the rate of precession is increasing. Therefore, no two ages are of equal length.
 
===First point of Aries alignment – the fiducial point===
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====Timeframes====
In 1928, at the Conference of the [[International Astronomical Union]] (IAU) in [[Leiden]], the [[Netherlands]], the edges of the 88 official constellations became defined in astronomical terms.{{cn|date=August 2024}} The edge established between [[Pisces (constellation)|Pisces]] and [[Aquarius (constellation)|Aquarius]] locates the beginning of the Aquarian Age around the year 2600.{{cn|date=August 2024}}
 
The Austrian astronomer, Professor [[Hermann Haupt (astronomer){{ill|Hermann Haupt]],<refF. name="Haupt">{{cite web |first=Sepp |last=Rothwangl |title=Considerations About the Start of the Age of Aquarius |url=http://cura.free.fr/xxv/21sepp2.htmlde}}</ref> examined the question of when the Age of Aquarius begins in an article published in 1992 by the Austrian Academy of Science: with the German title {{lang|de|"Der Beginn des Wassermannzeitalters, eine astronomische Frage?"}} ("The Start of the Aquarian Age, an Astronomical Question?").<ref name="Haupt">{{cite web |first=Sepp |last=Rothwangl |title=Considerations About the Start of the Age of Aquarius |url=http://cura.free.fr/xxv/21sepp2.html}}</ref> Based on the boundaries accepted by IAU in 1928, Haupt's article investigates the start of the Age of Aquarius by calculating the entry of the spring equinox point over the parallel cycle (d = – 4°) between the constellations Pisces and Aquarius and reaches, using the usual formula of precession (Gliese, 1982), the year 2595. However Haupt concludes:
 
{{blockquote|Though it cannot be expected that astrologers will follow the official boundaries of the constellations, there will be an attempt to calculate the entry of the spring equinox point into the constellation of Aquarius. [...<p>] As briefly has been shown, the results and methods of astrology in many areas, such as concerning the Aquarian Age, are controversial on their own and cannot be called scientific because of the many esoteric elements.<ref>Haupt, Herman, Prof., "Der Beginn des Wassermannzeitalters, eine astronomische Frage?", 1992</ref></p>}}
*''Zodiacal 30 degrees'':
**Neil Mann interpretation: begins AD 2150.{{sfnp|Mann|2007}}
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==Sub-periods of ages==
Many research astrologers believe that the astrological ages can be divided into smaller sections along the lines of 'wheels within wheels'. The most common method is to divide each astrological ages into twelve sub-periods.{{sfnp|MacKinnell|2002|p=10}} There are two common ways of undertaking this process and two ways of applying these sub-periods. Furthermore, some astrologers divide the ages in different ways. For example, Lcdr David Williams employs a [[Decans|decan]]ate sub-division whereby each age is divided into three equal sections.<ref>Lcdr David {{sfnp|Williams, ''Simplified Astronomy for Astrologers'', 1980, American Federation of Astrologers, Tempe Arizona</ref>|2009}}
 
===Aries to Pisces sub-periods===
The most popular method of sub-dividing astrological ages is to divide each age equally into twelve sub-periods with the first sub-period Aries, followed by Taurus, Gemini, and so on, until the last sub-division, Pisces. Charles Carter was an early advocate of this approach.{{sfnp|Carter|19731951|pp=75–6}} Technically this approach is based on the twelfth harmonic of the zodiacal signs.
 
===Dwadasamsa sub-periods===
The alternative approach is to apply a method commonly used in Vedic astrology but with long antecedents also in westernWestern astrology.<ref>Per {{harvp|Ennis|1983|p=57}}, the ancient Roman astrologer Manilius used dwadasamsa but called them dodecatemorion (sometimes 'duodecatemorion') – Stephanie Jean Ennis, ''Decanates and Dwads'', 1983, p. 57 {{ISBN|0-86690-239-2}}</ref> This method also divides each astrological age into twelve sub-periods but the first sub-period for each sign is the same as the sign itself, then with the following sub-periods in natural order. For example, the twelve dwadasamsa of Aquarius are Aquarius, Pisces, Aries, Taurus, and so on, until the last dwadasamsa – Capricorn. Technically this approach is based on attributes of both the twelfth and thirteenth harmonics of the zodiacal signs and can be considered to be halfway between the 12th and 13th harmonics.
 
===Sub-period direction (forward or retrograde?)===
There are two ways of applying the above sub-periods to the astrological ages.
*Natural Order – The most common way is to arrange the sub-periods so that they go forward in the natural order. Therefore, if the Aries to Pisces method is adopted for example in the Aquarian Age, the first sub-period is Aries, followed by Taurus, Gemini and so on until the last sub-division – Pisces. This is the approach made by Charles Carter. If the dwadasamsa sub-period is adopted they also progress in the natural order of the signs. For example, the twelve dwadasamsa of Aquarius are Aquarius, Pisces, Aries, Taurus, and so on, until the last dwadasamsa – Capricorn.
*Geometric Order (Retrograde) – The other approach is to arrange the sub-periods geometrically and reverse the direction of the sub-periods in line with the retrograde order of the astrological ages. For example, if applying the Aries to Pisces method, the first sub-period of any astrological age is Pisces, followed by Aquarius, Capricorn, and so on, until the last sub-period – Aries. Charles Carter indicated there was some merit to this approach.{{sfnp|Carter|19731951|p=76}} If applying the dwadasamsa sub-period system geometrically for example the first sub-period in the Aquarian Age is Capricorn, followed by Sagittarius, Scorpio, and so on, until the last sub-period – Aquarius. This approach is adopted by Terry MacKinnell,<ref>Terry {{sfnp|MacKinnell, "The Cusp of Ages" published in ''The FAA Journal'' June |2001 Vol 31 No. 2. pp. 33–42</ref>}} Patrizia Norelli-Bachelet<ref>Patrizia {{sfnp|Norelli-Bachelet, ''The Gnostic Circle'', Samual Weiser Inc, New York, 1978</ref>|1994}} and Lcdr David Williams applied his [decans] (threefold division) geometrically thus supporting this approach.
 
==New, alternative, and fringe myths==
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Terry MacKinnell has developed an alternative approach to calibrating precession of the equinoxes to determine the Astrological Age. His major point of departure from the traditional modern approach is how he applies the vernal equinox to the zodiacal constellations. Instead of referring to the position of the Sun at the vernal equinox (a 'modern' mathematical technique developed by the Greeks in the late 1st millennium BC), he refers to the [[heliacal rising]] constellation on the day of the vernal equinox. This approach is based on the ancient approach to astronomical observations (the same ancient period that also saw the invention of the zodiacal constellations) prior to the development of mathematical astronomy by the ancient Greeks in the 1st millennium BC. All ancient astronomical observations were based on visual techniques.{{sfnp|Neugebauer|1969|p=106}}
 
Of all the key techniques used in ancient times, the most common in Babylon (most likely the source of astrology) and most other ancient cultures were based on phenomena that occurred close to the eastern or western horizons.{{sfnp|Neugebauer|1969|p=98}} MacKinnell opines that it is incongruent to use a modern mathematical approach to the much older constellations that were first described well before these mathematical approaches were invented.<ref>Mackinnell, "The Dawning – Shedding New Light on the Astrological Ages", 2011, pp. 26 – 29</ref>
 
The heliacal rising constellation at the vernal equinox is based on the last zodiacal constellation rising above the Eastern Horizon just before dawn and before the light of the approaching Sun obliterates the stars on the eastern horizon. Currently at the vernal equinox the constellation of Aquarius has been the heliacal rising constellation for some centuries. The stars disappear about one hour before dawn depending upon magnitude, latitude, and date. This one hour represents approximately 15 degrees difference compared to the contemporary method based on the position of the Sun among the zodiacal constellations.<ref name="{{sfnp|Rogers">John H Rogers, "Origins of the ancient constellations: I. The Mesopotamian traditions", ''Journal of the British Astronomical Association'', 108,1, |1998, |p. =9</ref>}}
 
Each age is composed of 30 degrees, therefore, 15 degrees represents about half an age or about 1080 years. Based on the heliacal rising method, the Age of Aquarius arrived about 1,080 years earlier than the modern system. John H Rogers in part one of his paper ''Origins of the ancient constellations'' also states that using the ancient heliacal rising method compared to the (modern) solar method produces a result that is approximately 1,000 in advance.<ref name="{{sfnp|Rogers" />|1998|p=9}}
 
Using this approach, the astrological ages arrive about half an age earlier compared to the common contemporary approach to calibrating precession based on modern mathematical techniques. Thus, MacKinnell has the Aquarian Age arriving in the 15th century while most astrologers have the Age of Aquarius arriving in the 27th century,{{sfnp|Campion|2004|pp=488–495}} almost 700 years in the future.<ref>Terry {{sfnp|MacKinnell, "The Mysterious Zodiacal Constellations", published in ''The International Astrologer'' Vol XXXI No. 3, 2002, pp. 29–33</ref>|2002b}}
 
==See also==
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===Works cited===
{{lacking ISBN|date=September 2022}}
{{refbegin|2|indent=yes}}
*{{cite book |last=Campion |first=Nicholas |author-link=Nicholas Campion |year=2004 |title=The Book of World Horoscopes |publisher=The Wessex Astrologer |location=Bournemouth, Great Britain |isbn=978-1-902405-15-5}}
*{{cite book |first=Charles |last=Carter |title=An Introduction to Political Astrology (Mundane Astrology) |publisher=TheL. CamelotN. PressFowler |place=Great Britain |year=19731951 |isbn=978-0-85243-004-0}}
*{{cite book |firstlast=RayDeclercq |lastfirst=GrasseGeorges |title=SignsAnno ofDomini: theThe Times:Origins Unlockingof the SymbolicChristian Language of World EventsEra |publisher=Hampton Roads Publishing CompanyBrepols |year=20022000 |locationisbn=Charlottesville, Virginia978-2-503-51050-7}}
*{{cite book |last=Ennis |first=Stephanie Jean |year=1983 |title=Decanates and Dwads |publisher=American Federation of Astrologers |isbn=978-0-86690-239-7}}
*{{cite book |last=Evans |first=James |year=1998 |title=The History and Practice of Ancient Astronomy |publisher=Oxford University Press |isbn=978-0-19-509539-5}}
*{{cite book |first=Ray |last=Grasse |title=Signs of the Times: Unlocking the Symbolic Language of World Events |publisher=Hampton Roads Publishing Company |year=2002 |location=Charlottesville, Virginia |isbn=978-1-57174-309-1}}
*{{cite journal |first=Terry |last=MacKinnell |title=The Cusp of Ages |journal=The FAA Journal |date=June 2001 |volume=31 |number=2 |pages=33–42}}
*{{cite journal |first=Terry |last=MacKinnell |title=The Mysterious Zodiacal Constellations |journal=The International Astrologer |volume=XXXI |number=3 |date=2002b |pages=29–33}}
*{{cite news |first=Terry |last=MacKinnell |title=A New Look at the Old Ages |newspaper=NCGR Member Newsletter |publisher=National Council for Geocosmic Research Inc. |date=June–July 2002}}
*{{cite web |last=Mann |first=Neil |year=2007 |url=http://www.yeatsvision.com/GreatYear.html |title=W.B. Yeats and a Vision: The Astrological Great Year |website=Yeatsvision.com |access-date=2022-09-11}}
*{{cite book |first1=Marcia |last1=Moore |first2=Mark |last2=Douglas |title=Astrology, the Divine Science |publisher=Arcane Publications |place=York HarbourHarbor, Maine |year=1971}}
*{{cite book |last=NeugebauerMosshammer |first=Otto|author-link=OttoAlden EA. Neugebauer |year=1969 |title=The ExactEaster SciencesComputus inand Antiquitythe Origins of the Christian Era |publisher=DoverOxford PublicationsUniversity Press |year=2009 |isbn=0486223329978-0-19-172006-2}}
*{{cite book |first1last=DerekNeugebauer |last1first=Parker Otto|author-link=DerekOtto ParkerE. |first2=JuliaNeugebauer |last2year=Parker1969 |author2-linktitle=JuliaThe ParkerExact (astrologer)Sciences |title=Parkers'in Encyclopedia of AstrologyAntiquity |publisher=WatkinsDover PublishingPublications |locationisbn=London |year=2009978-0-486-22332-2}}
*{{cite book |last=Norelli-Bachelet |first=Patrizia |year=1994 |title=The Gnostic Circle: A Synthesis in the Harmonies of the Cosmos |publisher=Aeon Books |isbn=978-0-87728-411-6}}
*{{cite book |last=Rothwangl |first=Sepp |chapter=Consideration of the Origin of the Yearly Count in the Julian and Gregorian Calendars. Cosmology Through Time |editor1-first=G. |editor1-last=Giobbi |editor2-first=S. |editor2-last=Colafrancesco |title=Cosmology Through Time: Ancient and Modern Cosmologies in the Mediterranean Area: Conference Proceedings, Astronomical Observatory of Rome, Monteporzio Catone, June 17–20, 2001 |year=2003 |place=Italy |publisher=Mimesis |isbn=978-8884831521}}
*{{cite book |first1=Derek |last1=Parker |author-link=Derek Parker |first2=Julia |last2=Parker |author2-link=Julia Parker (astrologer) |title=Parkers' Encyclopedia of Astrology |publisher=Watkins Media |location=London |year=2009 |isbn=978-1-905857-71-5}}
*{{cite book |last=Rothwangl |first=Seth |chapter=The Cosmological Circumstances and Results of the Anno Domini Invention: Anno Mundi 6000, Great Year, Precession, End of the World Calculations |editor1-first=Anna-Teresa |editor1-last=Tymieniecka |editor2-first=Attila |editor2-last=Grandpierre |title=Astronomy and Civilization in the New Enlightenment: Passions of the Skies |publisher=Springer Netherlands |year=2010 |isbn=978-9048197484}}
*{{cite bookjournal |last=SpencerPingree |first=NeilDavid |year=20001972 |title=TruePrecession asand Trepidation in Indian Astronomy before A.D. 1200 |journal=Journal for the StarsHistory Aboveof Astronomy |publishervolume=Victor3 Gollancz|number=1 |locationpages=London27–35 |isbndoi=978-057506769110.1177/002182867200300104|bibcode=1972JHA.....3...27P }}
*{{cite journal |last=Pingree |first=David Edwin |title=The Recovery of early Greek astronomy from India |journal=Journal for the History of Astronomy |volume=7 |year=1976 |issue=2 |page=112|doi=10.1177/002182867600700202 |bibcode=1976JHA.....7..109P }}
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{{refend}}