Delphinus or the Dolphin is a small constellation in the northern hemisphere. It was created by the Greek astronomer Ptolemy in the 2nd century. In Greek mythology, Delphinus is identified with the dolphin that helped the god Poseidon win over Amphitrite, a Nereid who had been fleeing from his advances. The dolphin was able to change her mind and, out of gratitude, Poseidon placed its image in the sky. In another tale, Delphinus is associated with the dolphin who saved the life of the Greek poet Arion of Lesbos. Arion was returning home with the fortune he had amassed on his travels and the crew of the ship started plotting to kill him and steal the fortune. Faced with death, his last wish was to sing a dirge. As he sang, he jumped into the sea and was saved by a dolphin which had been enchanted by his music. The Arabs called the constellation Al Ka'ud ("the Riding Camel"), while Indians also associate it with a dolphin.
The constellation Delphinus occupies an area of 189 square degrees and contains four stars with known planets. It lies near the celestial equator and can be seen at latitudes between +90° and -70°. It is best visible at 9 p.m. during the month of October.