ASTR 1000-002, Week 2, Notes
ASTR 1000-002, Week 2, Notes ASTR 1000-002
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This 2 page Class Notes was uploaded by Jenna Notetaker on Tuesday September 20, 2016. The Class Notes belongs to ASTR 1000-002 at University of Colorado at Boulder taught by Charles Danforth in Fall 2016. Since its upload, it has received 7 views. For similar materials see The Solar System (Lecture) in Astronomy and Physics at University of Colorado at Boulder.
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Date Created: 09/20/16
Astronomy Week 2 Diurnal motion rise in the east, and set in the west Seasons Earth is tilted toward the Sun during the summer, and tilted away from the Sun during the winter The ecliptic is not the same as the equator The ecliptic tilt is 23.5 Axis tilt in relation to the ecliptic Solstice Sun at maximum distance north or south of the celestial equator Equinox Sun crosses the celestial equator (equal night) Summer solstice highest path, rise and set at most extreme north of due east Winter solstice lowest path, rise and set at most extreme south of due east 26,000 year precession period The direction the angle points changes but the angle itself does not change Lower Sun = less energy per area = winter When the Sun is high in the sky = summer When the day is longer, more energy reaches Earth = more heat = summer Shorter days = less heat = winter Perihelion closest point to the Sun Aphelion furthest point form the Sun Planet means wanderer Planets orbit the ecliptic The 7 days are named after the 7 original planets Uranus is not quite bright enough to see with the naked eye Retrograde backwards movement of the planets in the sky Lunation one circuit through the moons phases Waxing getting bigger Waning getting smaller Blue moon is not blue and not very rare Blue moon the second full moon in a month Nodes in the moons orbit where the moon crosses the elliptic plane New Crescent First Quarter Gibbous Full Last Quarter Crescent New … Things in the sky go counter clockwise when viewed from the North Pole Last quarter = left side lit Eclipse when something passes through the shadow of another Lunar eclipse Earth’s shadow on the moon The moons’ orbit around the Earth is tilted 5 from the ecliptic Lunar eclipses are sometimes called blood moons The Sun and the moon have the same angular size viewed from Earth Diamond ring effect right before the solar eclipse Totality the solar corona The change in the moon’s size from seen by Earth by about 10% due to the distance from Earth (sometimes closer bigger, sometimes further smaller) Constellation a region of the sky with welldefined borders Local sky the sky as seen from wherever you happen to be standing Angular size the angle that appears to span in your field of view Angular distance that angle that appears to separate them Constellations along the ecliptic make up the zodiac Precession the gradual wobble that alters the orientation of Earth’s axis in space Saros cycle the combination of the changing dates of the eclipse seasons and the 29.5 day cycle of lunar phases makes eclipses recur in a cycle of about 18 years, 11.5 days