Solar time and Sidereal (Star) Time

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Presentation transcript:

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

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

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

International Date Line Time zone at 180 degrees from Greenwich

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

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

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

Phases of the Moon Angle between Earth, Moon and Sun