Rotation
•The action of spinning on an axis •Causes night and day •1 Earth day = 24 hours •Ex. Ferris wheel, pinwheel Revolution •The movement of one object around another •Earth orbits the Sun •The Earth is at a constant tilt of 23.5º •Revolution + Tilt = Seasons 1 year = 365 ¼ days Summer Northern Hemisphere •The northern hemisphere is tilted toward the Sun. •Most direct sunlight (focused light) •Longer days and shorter nights. •North pole has constant daylight Fall Northern Hemisphere •The axis is not pointed towards or away from the Sun. •Equal sunlight in both hemispheres •Equal length days and nights at the equator Winter Northern Hemisphere •The northern hemisphere is tilted away from the Sun. •Most indirect sunlight •Shorter days and longer nights •South pole has constant daylight Spring Northern Hemisphere •The axis is not pointed towards or away from the Sun. •Equal sunlight in both hemispheres •Equal length days (12 hours) and nights (12 hours) at the equator Seasons Southern Hemisphere •Opposite of northern hemisphere •Ex. If it’s summer in Dallas, then it’s winter in Rio de Janeiro. Solstices •The longest or shortest days of the year •The Sun reaches its highest or lowest point in the sky at noon. •Summer Solstice – about June 21st •Winter Solstice – about December 21st Equinoxes •Day and night are equal at the equator •Vernal equinox – about March 20th •Autumnal equinox – about September 22nd Comments are closed.
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Erik E. Mason
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