In astronomy the ray of celestial bodies (planets, stars, etc.) is generally referred to as the average distance from the center to the surface. This is because celestial bodies usually do not have a perfectly spherical shape, but are more or less crushed along an axis.
Always in astronomy, the radius of an orbit is the distance calculated from the center of the orbit to the center of the orbiting body. Since astronomical orbits are generally elliptical orbits, their radius is not constant, but varies continuously over time. Other designers wikitesto
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