Most of the constellation were discovered by

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Ptolemy: 48 constellations described in his great work, The Almagest, in the 2nd century AD.

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The 88 Constellations recognized by the International Astronomical Union.

The Greeks and probably by the Babylonians and still earlier peoples.

There are 88 officially recognized constellations in the sky, and these astronomical patterns have a fascinating and long history.

condenser is used to focus in the light microscope.