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In contrast, the Lunar distance (LD or ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit . The lunar distance is on average approximately 385,000 km (239,000 mi), or 1.28 light-seconds ; this is roughly 30 times Earth's diameter or 9.5 times ...
Moon's orbit and sizes of Earth and Moon to scale. ... (0.87 in) per year (2200 km or 0.56% or the Earth-moon distance per hundred million years) ...
Moon distance range to scale: Image title: Minimum, mean and maximum distances of the Moon from Earth with its angular diameter as seen from Earth's surface, to scale ...
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The Moon is Earth's only natural satellite.It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period at 29.5 Earth days, causing the same side of the Moon to always face Earth.
English: Illustration of Earth and Moon at the average distance from each other (semi-major axis) as seen from distant space If the preview width is 800 pixels wide, then each pixel is 500 km on the preview. This image is almost identical in proportions to File:Earth-Moon2.jpg
Because the Moon is so much closer to the Earth than the stars are, the position of the observer on the surface of the Earth shifts the relative position of the Moon by up to an entire degree. [ 13 ] [ 14 ] The clearing correction for parallax and refraction is a trigonometric function of the observed lunar distance and the altitudes of the two ...
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs ) to Earth.