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Kramer

Kramer Astronomy Chap. 2

QuestionAnswer
The imaginary vertical line around which the earth spins Axis
The spinning of the earth on its axis, causes day and night Rotation
The point where the Earth is closest to the Sun in Earth's yearly orbit around the Sun Perihelion
Earth's yearly orbit around the Sun Revolution
The point where the Earth is farthest from the Sun in the Earth's yearly orbit around the Sun. Aphelion
Twice-yearly point at which the Sun reaches its greatest distance north or south of the equator Solstice
Occurs on December 21 or 22. The period when Earth experiences the shortest number of daylight hours and the longest number of nighttime hours in the northern hemisphere Winter Solstice
Occurs on June 21 or 22. The period when Earth experiences the longest number of daylight hours and the shortest number of nighttime hours in the northern hemisphere. Summer Solstice
Occurs in the spring when the Sun's vertical rays strike directly on the equator, producing an equal number of daytime and nighttime hours in a 24 hours period. Vernal Equinox
Occurs in the fall when the Sun's vertical rays strike directly on the equator, producing an equal number of daytime and nighttime hours in a 24 hours period. Autumnal Equinox
Created by: marilyn.kramer on 2008-09-22



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