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TIME

TIME. Solar time and Sidereal (Star) Time. Lines of Longitude. Separated by 15 degrees (time zones) 24 x 15 degrees = 360 degrees. Latitude. Latitude of equator = 0 Latitude of poles = + 90 and -90. Latitude and Longitude. Prime meridian Greenwich England Two number define a point.

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TIME

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  1. TIME Solar time and Sidereal (Star) Time

  2. Lines of Longitude • Separated by 15 degrees (time zones) • 24 x 15 degrees = 360 degrees

  3. Latitude • Latitude of equator = 0 • Latitude of poles = + 90 and -90

  4. Latitude and Longitude • Prime meridian Greenwich England • Two number define a point

  5. Time Zones • A time zone is 15 degrees wide • There are 24 in all, 24 x 15 = 360 degrees

  6. Real Time Zones • Time Zones are irregular for political and practical reasons (4 in USA)

  7. International Date Line • Time zone at 180 degrees from Greenwich

  8. Crude History of Calender • Leap Year and Major Corrections • Modern Gegorian Calendar

  9. Solar vs. Sidereal Time • Solar Time has 24 hours (arbitrary) • Sidereal Time is 4 minutes less (23h56m)

  10. Lunar Calendar Solar Months • Synodic or Solar Month (~ 29.5 days) • Sidereal Month (27.3 days)

  11. Phases of the Moon • Angle between Earth, Moon and Sun

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