Video transcript of meeting
- Silent Sky at Langham Court Theatre – performances Jan 25 to Feb 11
- Positive comments from RASC members who attended performances, especially Sara Ellison’s presentation at the end of the Sunday afternoon performance.
- Full bus from Berwick House attended the Sunday afternoon performance
- Lots of seats are available for Wed, Thu & Fri upcoming performances
- History of the production by Jim Hesser
- Welcome from Jeff Pivnick
- Beginners’ SIG – tomorrow evening – David Lee
- Special General Meeting – Feb 13, 2023 – Randy Enkin
- Need to adopt new bylaws for Victoria Centre
- Presentation: A Brief History of Galaxies… – Sara Ellison
- Black Holes
- How can a black hole conserve angular momentum? – Randy Enkin
- Conservation of angular momentum examples
- Solar system
- Earth-Moon system
- Black Holes – 1915 Albert Einstein, 1916 Karl Schwarzchild (point singularity), 1963 Roy Kerr (ringularity)
- Conservation of angular momentum examples
- What really happens at the black hole singularity? – John McDonald
- Black Holes can be explained somewhat by Gravity (very large things) and Quantum Theory (very small things)
- What happens to information that falls into a Black hole? We don’t know.
- Black Holes are not likely a singularity, so it’s unknown what form they actually take
- Entropy – measure of the disorder of things
- How can a black hole conserve angular momentum? – Randy Enkin
- Uranus – Jeff Pivnick
- Relative distances of planets in solar system
- Distance from the Sun to Saturn is about the same as the distance from Saturn to Uranus
- Photos of Uranus taken by John McDonald and Lucky Budd – Zenfolio | RASC Victoria Centre | Search
- William Herschel, an astronomer, reflecting telescope maker, musician and composer
- Discovered Uranus on March 13, 1781
- Discovered infrared light
- Caroline Herschel – first professional astronomer (paid by the king)
- NGC list was first compiled by the Herschels
- Horizons – Dorothy Paul
- Observed from the White Mountains of California in October 2022
- Camped for 10 days with 7 days of good observing skies
- SQM at least 21.8, with good transparency and stability
- Dorothy and Miles observed the southern sky from 38.5º north, observing the Grus constellation at -50º altitude!
- Observed stars right down to the True Horizon at -51.5º
- Discussion of the term Astronomical Horizon
- Comet C/2022 E3 (ZTF) photos – Dave Payne
- Globular Cluster discovered by Caroline Herschel
- Comet C/2022 E3 (ZTF) on Jan 28th
- Diatomic carbon causes the green colour in many comets, including this one
- RASC Victoria AGM tentatively to be held on March 13, predicated on the new bylaws being passed.
Astronomy Cafe – Feb 6, 2023