ASTRON 103 Chapter 9: Textbook Notes - 9
5 Oct 2016
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Origin: no clear origin, 7 days is about lunar cycle, used by babylonians & sumerians. France briefly post french revolution - 10 day week: seven visible objects across the sky. Names: germanic gods - direct parallel with greco-roman gods after whom the planets are named. Human cycle: week gives reasonable periods for work & rest, 7-day week dominant with spread of jewish, chrisitian, & islamic cultures. Origin: derived from moon"s cycles of phases. Interval between new moons is about 29. 53059 days. 12 lunar cycles = 11 days short of full year. Maintains the month , but has no relationship to the phases of the. Solar calendar = maintains month only as timekeeping convenience. 1 year = 12 lunar cycles (b. 1. a. 1) dates shift relative to seasonal postion of sun by. Night travel by moonlight was commonplace in middle: chinese & jewish calendars east when calendar was created.
