10 Equinox Equinox = when the sun is directly over the equator. Day and night are equal = 12 hours longSun rises due East, sets due WestVernal (spring) Equinox = March 20Autumnal (fall) Equinox = Sept. 22
11 Solstice Solstice = sun stop Summer Solstice ( 6/21) = Sun is directly over N (Tropic of Cancer) = most daylightWinter Solstice (12/21) = Sun is directly over S (Tropic of Capricorn) = least daylight
13 RotationDaily Motion = stars and planets rise in the East and set in the West. Why?Earth rotates counterclockwise at 15o / hr.Evidence:- Foucault’s Pendulum- Coriolis Effect – all winds move rightward in the northern hemisphere
15 Length of Day How long is a day? Is it 24 hours or 23 hrs. 56 minutes? Sidereal Day = actual time it takes to rotate 3600 (23h 56m).But, earth revolves around sun 10 in a day. So, it takes an additional 4 minutes to complete turn.Solar Day = Noon to Noon = Time it takes to rotate 3610 (24h).