The zodiac constellation Leo was catalogued along with 47 other constellations in "Almagest" by the famous Greco-Egyptian astronomer Claudius Ptolemy in the second century AD. Many ancient cultures recognized the constellation, referring to it as "the lion" in their languages due to the shape formed when connecting its stars.
The Leo constellation can be seen in the northern sky and is one of the biggest visible constellations. Leo is clearly visible during spring equinox from the northern hemisphere. The brightest stars of the Leo constellation are Denebola and Regulus. Cancer lies to the west and Virgo lies to the east of Leo. Leo is named after the Nemean lion of Greek mythology that was killed by Heracles during the first of his 12 labors..