| 单词 | semimajor axis |
| 例句 | What is the semimajor axis of a circle of diameter 24 cm? Astronomy 2016-10-13T00:00:00Z This is the equation of a horizontal ellipse centered at the origin, with semimajor axis 4 and semiminor axis 3 as shown in the following graph. Calculus, Vol 2 2016-03-30T00:00:00Z For example, the semimajor axis of the orbit of Mars, which is also the planet’s average distance from the Sun, is 228 million kilometers. Astronomy 2016-10-13T00:00:00Z In a circle, the semimajor axis would be the radius. Astronomy 2016-10-13T00:00:00Z The size and shape of an ellipse are completely specified by its semimajor axis and its eccentricity. Astronomy 2016-10-13T00:00:00Z Estimate the maximum and minimum time it takes a radar signal to make the round trip between Earth and Venus, which has a semimajor axis of 0.72 AU. Astronomy 2016-10-13T00:00:00Z Also, recall that a planet’s semimajor axis, a, is equal to its average distance from the Sun. Astronomy 2016-10-13T00:00:00Z Thus, Mars’ semimajor axis in astronomical units must be 1.52 AU. Astronomy 2016-10-13T00:00:00Z Kepler’s third law: The square of a planet’s orbital period is directly proportional to the cube of the semimajor axis of its orbit. Astronomy 2016-10-13T00:00:00Z The semimajor axis of Mercury’s orbit—that is, the planet’s average distance from the Sun—is 58 million kilometers, or 0.39 AU. Astronomy 2016-10-13T00:00:00Z Half this distance—that is, the distance from the center of the ellipse to one end—is the semimajor axis, which is usually used to specify the size of the ellipse. Astronomy 2016-10-13T00:00:00Z If the major axis of an ellipse is 16 cm, what is the semimajor axis? Astronomy 2016-10-13T00:00:00Z It has a semimajor axis of 84 AU. Astronomy 2016-10-13T00:00:00Z |
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