Where is the star Leo located and when is it located?

Leo is a constellation not a star


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Although Leo is the name of a constellation, several of the stars in the constellation share the name. The star "Regulus" is also known as "Cor Leo". All of the brightest stars in Leo are designated "Leo" with a Greek letter prefixing "Leo" to indicate they are in that constellation.

The constellation itself is found between Cancer and Virgo. Astronomically, the sun passes into the 30 degree portion of the sky marked by the constellation Leo from about mid August to mid September. Astrological systems assign the specific days a bit differently depending on the year and the particular astrological system.
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Because the sun is in Leo in August to September, the best time to see Leo at night is from November to May. Leo is dominant in the night sky at the opposite time of the year from when the sun transits the constellation; that is, from February to March.
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The Leonid meteor storm appears as if radiating from the constellation Leo, and is usually seen best in November.