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| | Calendars and their History |
 | | The principal astronomical cycles are the day (based on the rotation of the Earth on its axis), the year (based on the revolution of the Earth around the Sun), and the month (based on the revolution of the Moon around the Earth). |
 | | The solar cycle is the period after which weekdays and calendar dates repeat in the Julian calendar. |
 | | He knew that the year 1 B.C. was characterized by the number 9 of the solar cycle, by the Golden Number 1, and by the number 3 of the indiction cycle, i.e., (9,1,3). |
| astro.nmsu.edu /~lhuber/leaphist.html (8496 words) |
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