Sun-Moon-Earth System

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Presentation transcript:

Sun-Moon-Earth System Ch. 28 Sec. 3 Sun-Moon-Earth System

Daily Motions Sun gives us warmth and energy Moon rises our oceans and illuminates our sky Ancient calendars are based on moon and sun phases

Annual Motions Days and weather vary through out the year Annual changes from orbit around the sun Ecliptic: plane in which the earth orbits the sun

Earth’s Tilt Tilted at 23.5 degrees Axis tilt remains same all year This shows how the sun changes altitude in the sky Season are based on the tilt

Solstices Summer Solstice Sun overhead the Tropic of Cancer Around June 21 or 22 of each year Sun does not set in Arctic circle

Solstices Winter Sun directly over the Tropic of Capricorn Occurs on Dec. 21 or 22 Sun never rises in the Arctic Circle

Equinoxes Both have equal sunlight Vernal and Autumnal

Phase of the Moon Light is from the reflection of the sun As moon moves along it’s orbit, the amount of light we see increase Dark Moon positioned between earth and sun is New moon

Phase of the Moon Waxing: light that we can see is on the right side of the moon starts to increase Crescent – Less that half light is showing Gibbous – More than half light is showing Half of the moon is light: 1st quarter

Phase of the Moon Full moon: entire side is light: Full moon Waning: Light starts to decrease on the left side of the moon Half the moon is light: 3rd quarter

Motions of the Moon Time between full moons is known as the Lunar Month About 29.5 days Rises and sets 50 minutes later each day b/c moon moved 13o in orbit over 24 hr period

Tides Moon pulls up on the ocean and slingshots the water on the opposite side to create bulges Every 12 hrs the ocean level rises and falls

Solar Eclipse Moon passes between sun and earth Shadow in the inner/ darker portion is called the Umbra Outer/lighter shadow is the Penumbra

Effects of orbits Due to the difference in orbit keeps us from have an eclipse every month. Closest point that moon and earth are is Perigee Appears larger Farthest point is the Apogee Appears smaller

Lunar Eclipse Moon passes through earths Shadow

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