The sky at 00h on the 17th. September. Full Moon: 6th. September. New Moon: 20th. September. Autumnal Equinox: 22nd. September. Mercury reaches greatest Western elongation on the 12th. meaning it rises shortly before the Sun. It is a reasonably bright magnitude -0.4. It will be low down at sunrise so you will need a clear […]Read More September Night Sky.