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Kramer
Kramer Astronomy Chap. 2
Question | Answer |
---|---|
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 |