Astronomy Exam 1 Definitions Study Guide
Astronomy Exam 1 Definitions Study Guide PHYS 309
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This 1 page Study Guide was uploaded by Lauren Zerr on Sunday February 21, 2016. The Study Guide belongs to PHYS 309 at Fort Hays State University taught by Kayvan Aflatooni in Spring 2016. Since its upload, it has received 70 views. For similar materials see Descriptive Astronomy in Physics 2 at Fort Hays State University.
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Date Created: 02/21/16
Astronomy Definitions Study Guide hypothesis a testable idea theory a description of nature, based on a great deal of data to explain what we see asterisms groupings of stars that trace out pictures in the sky by connecting stars from dot to dot constellations 88 divisions of the sky, semi- rectangular regions winter triangle Sirius, Betelgeuse, Procyon summer triangle Vega, Deneb, Altair north star Polaris from the big dipper follow the arc to Arcturus and speed on to Spica zenith the point in the sky directly above the observer on earth celestial sphere imaginary sphere of the universe centered around the Earth circumpolar stars that revolve around a pole, seeming to never set ecliptic the path the Sun takes in the sky right ascension listed in hours and minutes, lines going away from the celestial pole, similar to longitude declination concentric circles away from the celestial pole, similar to lines of latitude, measured in degrees equinox when the ecliptic and the celestial equator intersect, day and night everywhere is 12 hours long solstice when the sun reaches its northern and southernmost points in the sky, farthest away from the celestial equator synchronous rotation it takes the moon exactly the same amount of time to rotate the earth and to rotate on its axis sidereal month the time it takes the moon to rotate 360 degrees on its orbit synodic month the time it takes the moon to complete one full cycle of phases eclipses earth, sun and moon are in a straight line along a single plane lunar eclipse the moon passes through Earth's shadow solar eclipse the earth passes through the moon's shadow umbra the darkest part of Earth's shadow penumbra the lighter part of Earth's shadow total lunar eclipse if the moon passes entirely into earth's umbra totality the period in which the Moon is
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