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The Western Sydney Amateur Astronomy Group (WSAAG) is a group of enthusiastic and dedicated amateur astronomers based in the western suburbs of Sydney, NSW, Australia.
WSAAG provides a focus for people interested in astronomy to meet, do astronomy and have fun. Members come from all walks of life and have a diverse range of interests, some have telescopes and some don't.
We don't mind if you own a push-to or a go-to telescope or if you don't own a telescope at all. You don't need to know the sky and you don't need to be a rocket scientist to join.
All you need to join is anything ranging from an interest to a passion for astronomy.
Visit Us
Visit Us
We welcome visitors at out night sky observing sessions and monthly meetings. We recommend attending two of our events as a visitor before deciding to become a member.
Become a Member
Become a Member
As a club member, you have acess to club telescopes and other equipment, as well as the expertise and experience of our long-term members.
Book us for your Event
Book us for your Event
We regularly support community events at schools and other organisations. We can bring out telescopes and show your visitors the wonders of the night sky.
Contact us to enquire about how we can support your event.
WSAAG Events
WSAAG Events
Monthly meetings are held on the third Wednesday of the month (excluding January and December). Meetings are held at Kingswood and online via Zoom.
Night sky viewing sessions are held about twice a month at Linden Observatory in the Blue Mountains. The exact dates depend on the phase of the moon.
Contact us for details.
View the full events calendar.
General Meeting: Wednesday May 20th 2026
General Meeting: Wednesday May 20th 2026
Speaker: Nada Salama - University of Sydney (SIfA)
Speaker: Nada Salama - University of Sydney (SIfA)
Topic: Microlensing of Microlensing: a new lens on the universe
Topic: Microlensing of Microlensing: a new lens on the universe
Gravitational lensing occurs when a massive object, such as a galaxy, bends the light from a more distant source. In some cases, this produces multiple images of the same object, and the light from each image arrives at Earth at different times. By measuring these time delays in certain systems, we can estimate the expansion rate of the Universe, known as the Hubble constant. These measurements help to address the current “crisis in cosmology”, the Hubble tension.
On smaller scales, stars and black holes within lensing galaxies introduce additional deflections. This effect, known as microlensing, creates complex patterns of brightening and dimming that must be understood statistically in order to extract reliable information from lensing systems.
This talk will introduce the concept of gravitational lensing as cosmological tool, explain how microlensing complicates and enriches these observations, and highlight recent developments in more complex scenarios such as double-plane lensing, where multiple layers of matter along the line of sight shape the final signal we observe.
Visitors wishing to attend in person or online via Zoom must email us to make a booking.
Western Sydney International Airport - Flight Paths Over Linden Observatory
Western Sydney International Airport - Flight Paths Over Linden Observatory
The final Environmental Impact Statement was released in October 2024. The EIS and related documents can be found on the WSI Flight Paths Site.
Of particular significance is the EIS Submissions Report (See Appendix A of this report) which addresses the issues raised by WSAAG in our submission.
See also the submission in response to the draft EIS of 2023:
Submission by WSAAG - November 2023
Submission by The Linden Trust - December 2023
Submission by Federal Member for Macquarie, Susan Templeman - January 2024
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