Presentation on theme: "Insolation Insolation = Incoming Solar Radiation Energy in = Energy out or, Insolation In = Heat Out (Earth only emits heat)"— Presentation transcript:
Insolation Insolation = Incoming Solar Radiation Energy in = Energy out or, Insolation In = Heat Out (Earth only emits heat)
Factors 1.Angle of insolation - direct or indirect 2.Length of Day - how much sunshine is available. 3.Type of Surface: -- light or dark -- rough or smooth
Angle of Insolation
Axis Tilted Earths axis tilts Always tilts the same way = parallelism Seasons result.
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: - Foucaults 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.