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Unformatted text preview: Lab Quiz 2 04:40 Seasons • Tilt of the Earth’s axis • Elliptical orbit around the sun Insolation • Highest when the Sun’s rays strike Earth at 90º angle Tropic of Capricorn • Winter solstice (12/21) Tropic of Cancer • Summer solstice (6/21) Equinox • Equator equal night (3/21; 9/21) • When the days are 12 hours day/12 hours night Solar Altitude Angle • N Latitude = positive number • S Latitude = negative number • Zenith angle should always be positive (absolute value) o Ex/ Phx (33º N) on Jan 20 th (20º S) Zenith angle = 33 – (-20) 53º • Solar Altitude angle (elevation) = 90 – zenith o Ex/ 90 – 53 = 37º Arctic/Anarctic Circle • 66.5º N/S Vocab • Perihelion close to the sun • Aphelion away from the sun • Circle of Illumination ½ of the Earth is always receiving sun • Solar Declination latitude that the sun is directly overhead at noon • Insolation solar radiation • Zenith Angle angle between a point directly overhead & at the Sun @ solar noon...
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This note was uploaded on 04/30/2011 for the course GPH 23108 taught by Professor Brazel during the Spring '09 term at ASU.
- Spring '09