Earth-Sun Relationships p.p. 481 – 482 & 622 - 625 Nearly all energy that drives our weather and climate on Earth comes from the Sun Earth only absorbs.

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Presentation transcript:

Earth-Sun Relationships p.p. 481 – 482 & Nearly all energy that drives our weather and climate on Earth comes from the Sun Earth only absorbs less than one two billionth of this energy ( ) Seems small, but it is several hundred thousand times the electrical- generating capacity of the U.S.

Solar energy is NOT distributed evenly over Earth’s surface. This varies due to: Latitude Time of day Season of year

This causes unequal heating of the earth’s surface. The heat will try to balance, reach equilibrium. It is the unequal heating of the Earth that creates ___winds__ and drives the ocean’s _currents__ These movements transport heat from the tropics towards the _Poles__ in an attempt to balance energy differences. This is “WEATHER”

Earth’s Motions Rotation - The turn of the Earth on it’s axis. Equals 24 hr./1 day Revolution - The movement of the Earth around the Sun. Equals 365 days/1 yr.

Solar Day vs. Sidereal Day Noon occurs 4 min. earlier each day. After 6 months, “noon” occurs at midnight From one “noon” to the next. When the Sun reaches it’s Zenith About 24 hr.

Perihelion vs. Aphelion

Earth’s Precession

Complete Exercise 12- Demonstrating the effect that sun angle has on the amount of solar radiation a place receives

Earth’s Orientation Seasonal changes occur because Earth’s position relative to the Sun ___continually changes___ as it travels along the orbit. The result of the above motions and a 23½ o inclination (tilt) is the reason for ________seasons____. Because of this inclination (tilt) it changes the angle of the Sun’s rays and the length of hours of daylight. This results in our seasons.

Solstices and Equinoxes Summer Solstice (longest daylight of the year) a.Occurs June _21_ or __22___. b.Official first day of _summer_. c.Sun’s vertical rays are located at the tropic of _Cancer_ which is 23 1/2 o North latitude. Winter Solstice (shortest daylight of the year) a.Occurs Dec. _21_ or __22_. b.Official first day of ___winter__. c.Sun’s vertical rays at located at the Tropic of __Capricorn_ at 23 1/2 o South latitude.

Autumnal equinox (equal hours of daylight and darkness) a.Occurs Sept. _22_ or _23_. b.Official first day of ___Fall or Autumn__. c.Sun’s vertical rays are located at the ___equator____. Spring equinox (equal hours of daylight and darkness) a.Occurs March _21_ or __22_. b.Official first day of ____spring__. c.Sun’s vertical rays are located at the ___equator____.

Length of Daylight 1.The length of daylight is determined by __Earth’s position in orbit__. 2.The farther you are north of the equator on the summer solstice, the longer __period of daylight_. 3.At the North Pole (June 21st) the length of daylight is ___24 hr.__. 4.At the South Pole (June 21st) the length of daylight is ___0, it’s dark 24 hr. a day_.