Presentation on theme: "Insolation Insolation = Incoming Solar Radiation Insolation In = Heat Out."— Presentation transcript:
Insolation Insolation = Incoming Solar Radiation Insolation In = Heat Out
Factors 1.Angle of insolation - direct (high angle) or indirect (low angle). Latitude has greatest effect on angle. 1.Type of Surface: light or dark, rough or smooth 2.Length of Daylight: longer days in summer
Angle of Insolation
Seasons Earth’s axis tilts Seasons result from this tilt. Distance to the Sun DOES NOT MATTER! In fact, Earth is closest to the Sun in our winter.
Equinox Equinox = when the sun is directly over the equator. Day and night are equal = 12 hours long Sun rises due East, sets due West Vernal (spring) Equinox = March 20 Autumnal (fall) Equinox = Sept. 22
Solstice Solstice = sun stop Summer Solstice ( 6/21) = Sun is directly over N (Tropic of Cancer) = most daylight Winter Solstice (12/21) = Sun is directly over S (Tropic of Capricorn) = least daylight
Rotation Daily Motion = stars and planets rise in the East and set in the West. Why? Earth rotates counterclockwise at 15 o / hr. Evidence: - Foucault’s Pendulum - Coriolis Effect – all winds move rightward in the northern hemisphere
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 (23h 56m). But, earth revolves around sun 1 0 in a day. So, it takes an additional 4 minutes to complete turn. Solar Day = Noon to Noon = Time it takes to rotate (24h).
Revolution Earth revolves around Sun 1 o / day. Also counterclockwise. Evidence: Seasons. Constellations change during year.