Sydney City Skywatchers member Garry Dalrymple has been observing sunspot activity lately with a small aperture telescope fitted with a...

Dr Toner Stevenson, History Affiliate, School of Humanities, The University of Sydney This blog post is to recognise Margaret Colville...

20 February 1962 John Glenn becomes the first American to orbit the Earth in his Friendship 7 spacecraft circling it three times. The...

Happy New Year! Elizabeth Cocking continues this astronomical blog post sequence in 2024. Each month she looks back on astronomical...

IN THIS MONTH 23 December 1672 Italian astronomer Giovanni Domenico Cassini observes Rhea, one of Saturn's Moons. Cassini discovered four...

11th November 1572 Supernova SN1572, also called B Cassiopeiae, is first observed by Danish astronomer, Tycho Brahe. The “new star” was...

24th October 1851 William Lassell finds not one, but two moons of Uranus on the same night when he discovers Umbriel and Ariel. There is...

17th September 1789 Mimas, the smallest and innermost of Saturn's major moons, is discovered by English astronomer William Herschel...

10th August 1675 The foundation stone for the Royal Greenwich Observatory (RGO) is laid by the first Astronomer Royal, John Flamsteed. ...

Fascinating anniversaries selected by Elizabeth Cocking. 6th July 1938 Lysithea, a moon of Jupiter, is discovered by Seth Barnes...