lecture2jan1708.ppt

lecture2jan1708.ppt - to make one revolution around the sun...

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2. Gregorian calendar: 365 days so need leap year every 4th year to keep calendar in line (to account for near 1/4 extra day) … Astronomy and the Earth’s Environment I. A. Rotation of Earth = to turn on its own axis 1. 1 rotation per solar day (23 hours 56 min) 2. Earth rotates west to east B. Revolution of Earth around the sun 1. Earth has 1 revolution every 365.241 solar days .  The earth  takes exactly 365 days, 5 hours, 48 minutes, and 46 seconds 
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Unformatted text preview: to make one revolution around the sun 3. Orbit of Earth is an ellipse not a perfect circle BUT every century no leap year (to account for 0.24 rather than 0.25) BUT every millennium we need a leap day (because 0.241 rather than 0.240) so in the year 2000 there was a leap day but in 2100 there wont be. Temperature Scales Figure 5.1 Annual March of the Seasons Figure 2.15...
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lecture2jan1708.ppt - to make one revolution around the sun...

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