The Hero

Perseus

Genitive: Persei · abbreviation Per

Best evening month

January

Visible from

45°S to 90°N

Centre RA

4h 24m 00s

Centre Dec

+45° 00′

In your sky

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Perseus, slayer of Medusa and rescuer of Andromeda. Algol, the 'Demon Star', marks Medusa's head and dims every 2.87 days as an eclipsing binary.

Ptolemy · Almagest, 2nd century AD