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Ch 1 Intro Part 2

Vocabulary

TermDefinition
Solar Day time between when the Sun is at its highest in the sky from one day to the next
Sidereal time for an object to spin (day) or orbit (month/year) with respect to background stars on the celestial sphere
Seasons changes in average temperature and day length due to the tilt of a planet's rotational axis
Zodiac 12 (astrological) constellations on the celestial sphere that the Sun appears to pass through in a year
Ecliptic apparent path of the Sun and planets on the celestial sphere relative to the stars over a year
Summer Solstice when the Sun is at its northernmost point above the celestial equator around June 21; longest daylight
Winter Solstice when the Sun is at its southernmost point below the celestial equator around Dec. 21; shortest daylight
Vernal Equinox when the Sun crosses the celestial equator while moving northward around March 21 (Spring)
Autumnal Equinox when the Sun crosses the celestial equator while moving south around Sept. 21 (Fall)
Precession slow change in direction of the rotational axis of a spinning object (e.g. a planet) due to gravity
Tropical Year time between one vernal equinox and the next
Solar Noon when the Sun reaches its highest point for the day in the sky at your location
Lunar Month time required for the Moon to complete a full cycle of phases (a.k.a. synodic month)
Synodic time for a body to return to the same position relative to the Sun as seen by an observer on the Earth
Lunar Phases because the Moon orbits Earth, the visible fraction of the lunar sunlit surface varies from night to night
Created by: john_bailey720
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