2 - Motion in the Sky - Slide 1 Lecture 2 Motion in the Sky...

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Slide 1 Lecture 2 Motion in the Sky ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 Yearly Motions The Earth travels around the Sun once every year. The Earth is tilted by 23.5 degrees with respect to the orbital plane. E E E E http://www.astro.uiuc.edu/projects/data/Seasons/seasons.html ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 The Sun lines up with different constellations during the year… These stars are overhead during the day. Sun is too bright to see them. These stars are visible at night. Presently These stars are visible at night. These stars are overhead during the day. Sun is too bright to see them 6 months later ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 4 Ecliptic Path of the sun through the celestial sphere Not aligned with Celestial Equator due to tilt of the Earth ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 Planetary Motion The planets all move in the same plane about the Sun so they all appear to move along the zodiac. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Summer Solstice North Celestial Pole South Celestial Pole Celestial Equator Ecliptic Summer Solstice : Sun reaches highest point in sky for N. Hemisphere. (June 21) Longest period of daylight in Northern Hemisphere E ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 7 Autumnal Equinox
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