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In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the two most widely separated points of the perimeter. The semi-major axis (major semiaxis) is the longest semidiameter or one half of the major axis, and thus runs from the … 展开
The equation of an ellipse is
where (h, k) is the center of the ellipse in Cartesian coordinates, in which an arbitrary point is given by (x, y).
The semi-major axis is the … 展开Orbital period
In astrodynamics the orbital period T of a small body orbiting a central body in a circular or elliptical orbit is: 展开CC-BY-SA 许可证中的维基百科文本 Kepler's laws of planetary motion | Wikipedia
The mathematical model of the kinematics of a planet subject to the laws allows a large range of further calculations.
Kepler's first law states that:
The orbit of every planet is an ellipse with the sun at one of the two foci.
Mathematically, an ellipse can be represented by the formula:Wikipedia · CC-BY-SA 许可下的文字Ellipse | Wikipedia
网页A general ellipse in the plane can be uniquely described as a bivariate quadratic equation of Cartesian coordinates, or using center, semi-major …
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Semi-major and semi-minor axes | Simple English Wikipedia, the …
网页In geometry, the semi-major axis is the distance from the center of an ellipse to the farthest point on the perimeter of the ellipse. The semi-major axis is half of the major axis, …
Chapter 5: Planetary Orbits | NASA Science
网页Semi-major axis and Eccentricity , which together are the basic measurements of the size and shape of the orbit's ellipse (described in Chapter 3. Recall an eccentricity of zero indicates a circular orbit).
When Wikipedia gives the semimajor axis of the Moon's orbit, …
网页The semi-major axis is the average distance between the barycenters of the two bodies, in this case the Moon and the Earth. We can double check that: The Earth-Moon distance …
13.5 Kepler's Laws of Planetary Motion | OpenStax
网页For any ellipse, the semi-major axis is defined as one-half the sum of the perihelion and the aphelion. In Figure 13.17, the semi-major axis is the distance from the origin to either …
13.5 Kepler’s Laws of Planetary Motion
网页The semi-major axis for the highly elliptical orbit of Halley’s comet is 17.8 AU and is the average of the perihelion and aphelion. This lies between the 9.5 AU and 19 AU orbital radii for Saturn and Uranus, respectively.
13.6: Kepler's Laws of Planetary Motion | Physics …
网页2022年9月12日 · For any ellipse, the semi-major axis is defined as one-half the sum of the perihelion and the aphelion. In Figure \(\PageIndex{4}\), the semi-major axis is the distance from the origin to either side of the …
Orbital elements | Wikipedia
网页Semi-major axis (a) — half the distance between the apoapsis and periapsis. The portion of the semi-major axis extending from the primary at one focus to the periapsis is shown as …
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