The dictionary defines binary as “composed of or involving two things”, so a binary star is a system composed of two stars which orbit ...

10th October 1846 Triton, the largest natural satellite of Neptune, is discovered by English astronomer William Lassell. The image of...

Wednesday 6th October 2021 6:30pm ​ Aboriginal Australians have been looking at the night sky for thousands of years. During this...

Following the spectacular total lunar eclipse of 26 May 2021 Sydney-siders are to be treated to a partial lunar eclipse. DATE:19 November...

Monday 1st November 2021 6:30 to 8pm ​ Presented by Mike Frost, Historical Section Director, British Astronomical Association The British...

There are two equinoxes every year. The March equinox also known as the autumnal equinox, and the September equinox or the spring...

By Monty Leventhal OAM IN SUMMARY Summing up, sunspot activity for solar cycle 25 has remained very low with Prominences & Filaments...

9th September 1892 Amalthea, a moon of Jupiter, is discovered by Edward Emerson Barnard using the 36 inch (91 cm) refractor telescope at...

Andrew Wood is an amateur astronomer and member of Sydney City Skywatchers. He has spent much of covid outside at night on Dharawal...

This month . . . Artificial Satellites. From the launch of Sputnik which lead to the start of the Space Race between the Soviet Union...