From the 2nd century AD the coincidence of Passover and Easter was recognized as a problem for the Christian church by the church authorities, and in the 4th century, after Christianity became the Roman state religion, Roman authorities took steps to prevent Passover and Easter coinciding. This effort was complicated by the growing separation between the churches in Rome and Constantinople. Though from the 2nd century the majority of Jews lived in the diaspora, at least up to the 10th century the calendar was governed by a rabbinical court in Eretz Israel (the Land of Israel). Here we discuss the changes in the Jewish calendar in the 5-8th centuries AD, the middle (c. 636 AD) of which period witnessed an abrupt transition from Byzantine rule over Eretz Israel to Arab rule. In this period no serious changes were made in the basic mathematics of the Jewish calendar; the only changes had a political context. Here we discuss a single but singular feature of the Jewish calendar, the ‘Deĥiyot’ [postponements] of Rosh Hashana. Our major claim is that Deĥiyah D [postponement from Wednesday to Thursday] and Deĥiyah U [postponement from Friday to Saturday] entered the calendar c. 532 AD as an ingenious Jewish response to Emperor Justinian’s ban against the Passover feast (Nisan 14) falling on a Saturday, instituted to mend a famous calendar rift between the Roman and Alexandrian churches. Next we claim that Deĥiyah A [postponement from Sunday to Monday] became part of the calendar no earlier than when the 2nd day of the festivals Rosh Hashana [New Year] and Sukkot [Tabernacles] acquired the status of sacred day and we raise the lower historical boundary of Deĥiyah A’s introduction in the calendar up to the time of the first Gaonim [heads of talmudic academies in the Arab caliphate] (c. 658 AD). We also suggest the reasons for the timing of three other deĥiyot.

When was it that someone first gazed up at the Summer Milky Way and recognized the Cross among the stars of Cygnus? After the Big Dipper and the Seven Sisters of the Pleiades, the Northern Cross is among the most familiar of asterisms, for Westerners at least. Turn to almost any modern handbook on the constellations and we find under Cygnus that the Swan often goes by this well known alias. Little explanation is required; the Cross being simply a matter of common knowledge. But when did it become so? One such popular guide, by the late veteran interpreter of the stars, Julius Staal, ventures only that it was ‘early Christians’ who recognized the cruciform shape of Cygnus.1 It is certainly a reasonable guess; but, which early Christians recognized the Cross where others in their day would have imagined a great swan flying along the river of milk flowing from Hera’s breast? Although it seems little more than an odd bit of trivia, attempting to answer the question of the asterism’s antiquity touches on some interesting aspects of our cultural history. I hope to show how light from this admittedly peculiar angle may illuminate ways that astral imagery played upon the early Christian imagination, particularly as related to aspects of the history of Constantine the Great, the first Christian emperor of Rome.

. This paper addresses the question of the kind of knowledge which informed the astrological practice of Marsilio Ficino, and in so doing distinguishes between two modes of understanding the human relationship to the cosmos, the natural scientific and the magical. I will seek to show that Ficino’s critique of his contemporary astrologers derived from their lack of symbolic understanding, and I shall attempt to explore the nature of this understanding which for Ficino was fully revealed in the Platonic and Hermetic traditions. Finally I shall suggest that in his system of natural magic Ficino re-defined astrology as a unitive tool for healing, founded on both ‘scientific’ investigation into cosmic law and divinatory experience.

This paper is an historiographical inquiry into some problems that arise when confronted with so-called supernatural, irrational or superstitious phenomena in human history. Other descriptions are possible, of course, but none of them without at least some question-begging – something that itself points to the principal problem. As an initial formulation, let us define that as follows: how can the historian describe and explain these phenomena without participating in the very processes – characteristically, to coin a phrase, ones of power/knowledge – that produced them in the first place?1 And this problem becomes especially acute when the discourse in question, like astrology (but unlike, say, phrenology) is still the subject of contemporary controversy. This is not something I hope to resolve here, but perhaps I can improve the quality of the questions it raises.

The Raëlian Church is an atheistic religion with a cosmology that is compatible with modern science. Its founder-leader Claude Vorilhon (Raël), whose birth in 1946 is said to herald the new Age of Aquarius, offers a detailed interpretation of Judaeo-Christian scripture that claims a history of encounters a new highly evolved technological society, with the possibility of immortality for those who are worthy. Jung’s theory that flying saucers are a modern myth is used to demonstrate how Raëlianism finds it possible to synthesize UFOlogy and religion.

This article first examines astrologers’ protestations at growing religious hostility in the 1490s and the involvement of Ficino, Pico and Savonarola in Florence. It then charts the reactions to Pico’s Disputationes both in the anti-astrological camp’s enthusiastic endorsement, and especially in the riposte of professional astrologers across Europe, whose piece-meal replies, intensified by the approaching conjunction of 1524, include a call for internal reform through a rejection of Arabic methods. Pico’s technical and empirical secondary arguments emerge as more effective than the physical and moral primary ones and reveal his singular understanding of practitioners’ mentality.

The Italian High Renaissance saw the high point of the use of astrology in the timing of both military and political events. It is known that Cosimo I de’ Medici, Duke of Florence, delayed the decisive battle in his war against Siena in 1554, against the advice of his commanders in the field. A previously unpublished astrological prognostic may have influenced his military strategy which, in fact, led to his eventual victory at Marciano on 2 August 1554. This paper presents a discussion of the circumstances surrounding the campaign, and a translation and analysis of the prognostic sent to Duke Cosimo in March 1554 by the astrologer Francesco Formiconi.

The Mathesis of Julius Firmicus Maternus describes astrological aspects responsible for bestowing divinity and immortality. These conditions have been identified as the major astrological components of the Star of Bethlehem. Moreover, closer examination reveals that Firmicus juxtaposed pagan and Christian themes, which suggests he was a pagan making the transition to Christianity.

The explicit astronomical content of the great monument of Antiochus I of Commagene on the summit of Nemrud Dagh warrants the search for astronomical significance in the design of other monuments of this ancient Near Eastern kingdom of the first century BCE. The article advances the hypothesis that the nearby monument of Karakush, built by Antiochus’ son, Mithradates II, as a burial site for the royal women, was astronomically oriented, its three sets of peripheral columns being so positioned that during June Leo would be observed setting behind the lion columns after sunset, Aquila culminating over the eagle columns around midnight, and Taurus rising behind the bull columns before dawn. It is suggested, furthermore, that the astronomical occasion for the foundation of this second monument was a recurrence of significant planetary conjunctions in Leo. The ‘lion horoscope’ of Nemrud Dagh records the conjunctions of 62 BCE; the Karakush site may be related to the conjunctions of 27-26 BCE.

Although astrologers and astrological concepts were instrumental in formulating the core assumptions of the modern New Age movement in the late 19th and early 20th centuries, the increasing number of scholarly studies of the New Age movement pay almost no attention to astrology. The only two English language histories of modern astrology set out the role of the English astrologer Alan Leo (1860-1917) in creating an astrology designed to facilitate spiritual evolution and the coming of the New Age. This paper examines the foundation of an astrology of spiritual development and psychological growth in the USA and examines the key role played by Marc Edmund Jones (1888-1980). Jones used arguments based on the history of astrology, strongly influenced by theosophical theories of history, to justify his reform of astrology.