Test 1 Review

# Lunar month can fall at every possible season unlike

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lunar month”) can fall at every possible season unlike Christmas, Easter Julian Calendar: Julius Cesar 46 B.C., invented the leap year (Feb. 29 th every 4 years) 365 ¼ = 365.25 days in the Julian year

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Attempted to match the Tropical Year (seasons) o 365.2422 days lasted until 1582 A.D. Julian Calendar was roughly off by 10 days Gregorian Calendar: Pope Gregory XIII 1582 A.D. Rule: have the leap year every four years, except century years (end in “00”) o Skip leap year in: 1700, 1800, 1900; 2100, 2200, 2300; 2500, 2600, 2700; … o Have leap year in: 1600, 2000, 2400… Skipping leap year= 365+ 97⁄400= 365.2425 days o Very close to 365.2422 days in the tropical year Will run for ≈ 3300 years before it gets off by one day 2-29-1896 no leap year in 1900 2-29-1904 2-29-1996 yes 2-29-2000 2-29-2004 no leap year 2100 Adopted by Catholics: Oct 4, 1582 next day Oct 15, 1582 o Omitted 10 days British and American Colonies adopted the Gregorian Calendar Sep 2, 1752 Sep 14, 1752 o Omitted 11 days Reason 10 vs. 11 days: Century year Catholics British 1600 yes yes 1700 no yes 1800 no no 1900 no no 2000 yes yes 2100 no no George Washington’s Birthday: Wikipedia: Feb 22, 1732 Family Bible: “11 Feb 1731/32”
11 Feb= 22 Feb Nov Dec Jan Feb March April 1731 1731 1731/2 1731/2 1731/2 1732 Julian +11days Gregorian Purpose of calendar: o Easter falls on: The first Sunday after the first full moon after March 20 Earliest possible Easter: March 22 Latest possible Easter: April 25
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• Fall '12
• OLSON
• Othello, Gregorian calendar, Julian calendar

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