23._Astronomy-Sun-Earth-Moon_System1_1.pptx - The...

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The Sun-Earth-Moon SystemEEn.1.1.2 Explain how the Earth’s rotation and revolution about theSun affects its shape and how it is related to seasons and tides.
Daily and Annual MotionsReview:Earth rotates around the Sun in an elliptical motion1x a yearOur seasons depend upon the rotation around the sunand Earth’s axisEarth rotates around the axis 1x every 24hours(day/night)
Earth’s SeasonsAs the Earth rotates around the Sun,Earth’s axis remains fixed, so that, at onepoint, the N. hemisphere of Earth is tiltedtoward the Sun, while at another point 6months later, the N. hemisphere is tippedaway from the Sun
Earth’s SeasonsSeasons are created by this tilt andEarth’s orbital motion around the Sun
Changes in Earth’s Seasons
Nutation(wobbling in tilt of axis) can cause adecrease in thetemperature difference betweensummer and winter(winters warmer and summerscooler)Additional snow in latitudes near the poles wouldnot melt in summer and could result in expandedglacial coverage possibly leading to ice ages
Changes in Earth’s SeasonsEarth’s nutation occurs over a period of 26,000 yearsCurrently theaxis pointstoward theNorth Star, Polarisbut will tilt toward another star, Vega, by the year14,000
Changes in Earth’s SeasonsCurrentlysummer occurs when the Earth is

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Term
Summer
Professor
Angelichio
Tags
Equator, Sun Earth Moon System, Lengths of day

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