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1764516965
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title
Astronomical Coordinates
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Astronomical Coordinates Introduction It may be useful to explain the basis of astronomical coordinates for readers who are unfamiliar with them. There is also a need to clarify the distinction between these angular coordinates and ordinary “rectangular” three-dimensional spatial coordinates, which requires more discussion than is suited to the Glossary . This was brought to my attention by a reader who noticed that the Glossary's entries for the different kinds of “horizon” were vague and needed more details. The oversight was mine; I was so familiar with these terms that I had not noticed the subtle differences that require careful treatment. This page is an effort to fill the gap. Places and directions Astronomers and other technical workers distinguish the astronomical horizon from the apparent horizon , and from other kinds of horizons (such as the geometric horizon ). In addition, the place where the Earth and sky meet is sometimes treated as a physical location ...
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1764516965
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