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Observing the sky, orbits and gravity
The celestial sphere and the constellations, the birth of astronomy from Ptolemy to Kepler and Newton, orbital motion, and the cycles of seasons, moon phases, tides and eclipses.
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正面 accelerate背面 to change velocity; to speed up, slow down, or change direction.
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正面 angular momentum背面 the measure of the motion of a rotating object in terms of its speed and how widely the object’s mass is distributed around its axis
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正面 aphelion背面 the point in its orbit where a planet (or other orbiting object) is farthest from the Sun
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正面 apogee背面 the point in its orbit where an Earth satellite is farthest from Earth
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正面 apparent magnitude背面 a measure of how bright a star looks in the sky; the larger the number, the dimmer the star appears to us
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Creative Commons Attribution 4.0 International
CC-BY-4.0 - 署名
- Source : https://openstax.org/books/astronomy/pages/preface — Licence : Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
- 来源
- OpenStax — Astronomy (first edition)
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- 天文学
- 语言
- English
- 版本
- 3
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