Libra is a southern zodiacal constellation that represents the Weighing Scales. It lies between Virgo and Scorpius on the ecliptic. Zubenelgenubi and Zubenelschamali now represent the two ends of the balance beam of the Weighing Scales. Gamma Librae and Sigma Librae represent the weighing pans of the scales. Zubenelgenubi, however, means the "Southern Claw" and Zubenelschamali means the "Northern Claw". Gamma Librae, Zubenelakrab, means the "Shears of the Scorpion". All are Arabic names for the claws of the scorpion, which were originally part of the constellation of Scorpius. The claws later became part of the constellation of Libra, probably sometime during the days of the Roman empire. The Sun is located in the constellation of Libra from October 31 to November 23. Libra was cataloged by the Greek astronomer Ptolemy in the second century C.E. (Common Era). It is the 29th largest of today's 88 modern constellations, covering 538 square degrees of sky.