On the 15th December the Moon passes through the northern part of the Hyades star cluster passing close to the bright red star Aldebaran
On This Day (1)
December 15th 1964
Launch of San Marcos 1
This was the first launch of an entirely Italian designed satellite, San Marcos 1, it was designed to study the upper part of the Earths atmosphere, it re-entered the atmosphere and burnt up on September 13, 1965.
On This Day (2)
December 15th 1966
Discovery of Janus
Saturn`s 10th moon Janus was discovered by the French astronomer Audouin Dolfuss, it had been seen earlier but not recognised. Janus occupies practically the same orbit as the moon Epimetheus which during the 1970s and 80s confused astronomers who thought they were the same object. The size Janus is 203×185×152.6 km
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