Welcome to the Astronomical Society of South Australia

The Astronomical Society of South Australia is the only representative body for amateur astronomy in the state of South Australia. Founded in 1892 and with around 700 members, it is the oldest and one of the largest organisations of its kind in Australia.

Our monthly meetings, which usually feature a guest speaker, are free, open to the public and visitors are most welcome to attend.

ASSA@Home: Show & Tell

Friday, 21 August 2020 7:30 PM

ASSA members Dean Davidson, Ian Blackwell and Paul Martinaitis will be looking at some of the things you can construct at home to make your observing life easier. Relatively simple projects that will be presented and discussed will include DIY observing chairs, a parallelogram binocular mount, and an Alt-Az mount. We will also present a 12-inch "Dob in a Box", an eyepiece box, and (hopefully!) a progress report on a 14-inch go-to binocular. This show will be streamed LIVE with the opportunity to ask questions via chat.

Variable Stars (online)

Wednesday, 2 September 2020 7:00 PM

As a conclusion to the series on Stellar Evolution, we will take a look at Variable Stars. This will include exploring such objects as cepheid variables, long period variables like Mira, eclipsing binaries and cataclysmic variables like Eta Carina.

From 1609 to 1613 Galileo used his own astronomical telescope of unprecedented precision and power to make an avalanche of astounding new discoveries. This triggered a revolution in the way humanity sees its place in the cosmos. Some of these discoveries are well known like the discovery of the moons of Jupiter, the phases of Venus and the lunar landscape. But there is a surprise drawn from the pages of Galileo’s logbooks. He notes the position of a "fixed star" that does not exist in any star chart. This is because it is really the planet Neptune which Galileo observed 234 years before its official discovery. Remarkably, the notes from Galileo's observations reveal he observed Neptune move on two successive nights of January 1613. Did he know this "fixed star" was a planet? If so, this would be the first discovery of a new planet by humanity since deep antiquity. As I will discuss, evidence that Galileo realised he had seen a new planet could still be hidden deep in his notebooks. In this talk, Professor Jamieson will report on his examination of Galileo's notebooks and tell us what he found and what still might be undiscovered.

Members' Diary

August 2020
August 21, 2020

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Watch some of our recent events on our YouTube channel

Astronomy Education

Public Lectures



Latest Issue

Inside The Bulletin

Each month the Society publishes The Bulletin - a 16 to 20 page newsletter for members, containing information on astronomical news and events.

This month's issue includes:

  • Beginners guide to EQMOD install and setup on a WINDOWS 10 PC by Jamie Presser
  • Understanding Image Defects by David Arditti
  • Solar System Scene, July 2020 by John Newell
  • Member Profile: Fraser Farrell by Trish Ellin
  • Observatories in Odd Places No. 15 by Les Laub
  • Southern Hemisphere Comets by Michael Mattiazzo 
Read now


Membership is open to people of all ages and professions— the only pre-requisite is an interest in astronomy. It does not matter how much you know about astronomy or any other science. The Society has something for you.Our members come from all walks of life. What they share is the enjoyment the night sky has to offer.

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