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Sagittarius A* (pronounced "Sagittarius A-star", standard abbreviation Sgr A*) is a bright and very compact astronomical radio source at the center of the Milky Way Galaxy, near the border of the constellations Sagittarius and Scorpius. It is part of a larger astronomical feature known as Sagittarius A. Sagittarius A* is believed to be the location of a supermassive black hole, such as are now generally accepted to be at the centers of most spiral and elliptical galaxies. Observations of the star S2 in orbit around Sagittarius A* have been used to show the presence of, and produce data about, the Milky Way's central supermassive black hole, and have led to the conclusion that Sagittarius A* is the site of that black hole.
The Annual Visibility of Sagittarius
Sagittarius is best observed during the Northern hemisphere summer months (winter in the Southern hemisphere) because during this time the constellation is visible throughout the night and is seen in darkness when it is highest in the sky. Southern hemisphere observers have the best view of Sagittarius, since it crosses almost directly overhead in the sky. In general, the Northern hemisphere has a less favorable view - the visibility of the constellation being worse the further North one is situated. Indeed, the Southern section of the constellation cannot be seen at all from high Northern latitudes.