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- PH1600: Introductory Astronomy - asterisk. apod. com
Calendars Roman Calendar Originally lunar, but kept changing Lost many days per year had occasional leap months Julian Calendar Introduced in 46 BC by Julius Ceasar 365 days each year One leap day every four years Occurs in years evenly divisible by 4 Calendars Gregorian Calendar Decreed by Pope Gregory XIII in 1582 Accounted for inexactness of
- PH1600: Introductory Astronomy - asterisk. apod. com
Lecture material Listed wikipedia entries But not higher math APODs posted during the semester APOD review every week during lecture Completing the Quizzes Homework quizzes 1 - 9
- PH1600: Introductory Astronomy - asterisk. apod. com
Eclipses Two types: Solar Eclipse (Sun becomes dark) Lunar Eclipse (Moon becomes dark) Strange Coincidence: Moon and Sun have nearly exactly the same angular size Angular size: The angle something takes up Nearby small things can appear angularly large Far away big things can appear angularly small Total Solar Eclipse Moon totally blocks Sun
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