Star atlas

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A star atlas or sky atlas is a collection of star maps that show the entire star sky or a larger area of ​​it. In contrast to geographical atlases, it is always a projection of the celestial sphere and mostly on a uniform scale.

The purpose of these works is - as with individual star maps - multiple:

With the first star maps, the star locations were often only drawn in freehand according to the view of the sky, at best based on simple angle measurements. Exact map projections are used as a basis from around the 18th century, with the coordinates mostly coming from surveys , photographic recordings or star catalogs .

The map series show the brightness of the individual stars through signatures of various sizes, often also a graticule . If a star atlas is mainly used for amateur astronomy or to hold guided tours at public observatories , it usually also contains the constellations .

Well-known star atlases

See also

Individual evidence