Astronomy Study Guide

# Astronomy Study Guide - Astronomy Study Guide Astronomical...

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Astronomy Study Guide Astronomical Unit (AU) - As a science measures distances. Distance from the sun to the earth or earth to the sun. Light Years - Outer space ruler which equals the distance light travels in a year. Speed of light =186,000 miles/second 3 Steps of the Scientific Method 1. Gather physical data a. “physical”- 5 senses can record it 2. Interpret the data a. (theories, models, laws, hypotheses) 3. Test interpretation with new data a. (going back to step 1) Constellations - One of the stellar patterns identified by name, usually of mythological gods, people, animals, or objects. Also, the region of the sky containing that star pattern. Polaris - The North Star located near the north celestial pole. Celestial Sphere - An imaginary sphere of very large radius surrounding Earth and to which the planets, stars, sun, and moon seem to be attached. Latitude - Earth coordinates (Horizontal Circles) Longitude - Earth coordinates (Vertical half-circles) Latitude- equator = 0 degrees; poles = 90 degrees. Tell where you are with N, S. Longitude- Prime meridian= 0 degrees=> goes through Grennich, England and marked every 15 degrees which equals 1 time zone. Tell where you are E, W. -In the sky Latitude is declination. Longitude is right ascension. 0 degrees = spring equinox. Ecliptic - Path of sun across the sky and also the orbital plane of most planets. Earth’s axis of rotation points towards or away from the sun, there is a solstice. -Winter Solstice= Dec. 22 nd +-1 -Summer Solstice=June 22 nd +-1 -Tilt of the earth is 23.5 degrees Rotation=Spin

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Revolution=Orbit -Seasons are caused by the tilt in the earth and by directness of the sun. As the sun moves eastward around the sky, it spends half the year in the southern half of the sky, and half the year in the northern half. Tropic of Cancer - 23.5 degrees north of the equator. Tropic of Capricorn - 23.5 degrees south of the equator. -Always have a shadow in Indiana and in the tropics the sun is directly overhead twice a year. Arctic Circle
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## This note was uploaded on 09/08/2008 for the course ASTRO 101 taught by Professor Burchick during the Spring '08 term at Ball State.

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Astronomy Study Guide - Astronomy Study Guide Astronomical...

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