Date Resonance

Profiles a date: its numerology reductions, the Sun’s sign, decan and face at local noon (and the minute it changes sign on a cusp day), the Chinese sign, Moon phase, retrograde planets, nearest eclipses, the weekday’s planet, and the same day in the Hebrew, Chinese and Maya calendars and Anno Lucis; two dates can be compared. The 36 decans came into Hellenistic astrology from Egyptian star clocks.

• O. Neugebauer and R. A. Parker, Egyptian Astronomical Texts, 3 vols. (Providence: Brown University Press, 1960–1969)
• Edward M. Reingold and Nachum Dershowitz, Calendrical Calculations, 4th ed. (Cambridge University Press, 2018)