Presented on-line via zoom Title: Weighing black holes and dark matter The supermassive black hole that resides at the center of a galaxy...

By Jeff Portelli Les Dalrymple was passionate about astronomy, and an exceptionally knowledgeable and experienced amateur astronomer. He...

Our quarterly magazine features significant events in astronomy, members observations and tips for amateur astronomers. Download and read...

by Toner Stevenson Many Sydney City Skywatchers members are avid readers and much of our discussion before and after our in person...

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

I found this book compelling because Noon and De Napoli, both Indigenous astronomers, combine their Western scientific knowledge with...

This is the story of two intrepid scientists who for the good of France and all mankind set out on a mission to measure the earth during...

Presentation on dark sky and Indigenous rights.

Presented at Sydney Observatory and on-line. Comparing the rotation and random motions of stars and gas in galaxies at different...

Review by Dr. Nick Lomb William Dawes: Scientist, Governor, Abolitionist: Caught Between Science and Religion, by Richard de Grijs and...