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Referências
- [1]Astronomical Algorithms, 2nd ed. — Jean Meeus (Chapter 15: Rising, Transit & Setting)— Willmann-Bell
- [2]USNO — Sunrise/Sunset Computation (planetary hour basis)— U.S. Naval Observatory
- [3]British Museum — Babylonian Astronomical Diaries (Chaldean Planetary Order, c. 500 BCE)— The British Museum
- [4]NASA — Calendars and Historical Astronomy (Planetary Weekday Origins)— NASA Eclipse Web Site