- This
is not a class on history of calendar
-
calendars have been around for a very long time
LEAP
YEAR JULIUS CEASAE 46 BC
- Greg
13th set up a committee: 1582
- what
we are left with:
months,
days, years, leap years, days of week
- 3
calendar reference points –
- Passage of moon around the sun (luna month) – interval between 2 new moons, 29 d, 12h, 44”, 3 seconds on avg (from 29D, 6H to 29D 20H
-Earth’s orbit around the sub (the year) tropical year = 365days, 5 hours, 48 “, 45.96’ (loses 5 seconds every 1000 years)
- Earth’s rotation on exis (leght of day)
duraiton
of day – 23.59.39 to 24.0.30
- stellar year – time for sun to return to positon facing a given star 365 days, 6 hours, 9 minutes, 9.54 seconds
Babalonyans
created 2 12-parts of the day;
Also
gave us 60 minutes to the hour
Week
cycle only one not based on planetary or natural occurrences
Sun,
Moon, Mars, Mercury, Jupiter, Venus, Saturn.
- SEVEN
STARS IN THE SKY
2350
Mesopotamia King Asad of Sarmia UR
Weeks
systems based on
- need for complex divinatory cycles
- market economy
- rlgious motives
In Mesopotamia , 7 was an unfavorable number
Introduction
++++++++++++++++++++++++++
How I Started This
Why I am Teaching This
The Formula and Rules
Miscellaneous
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