Q. At 12.00 midday each day (weather permitting) I mark the shadow cast by the top corner of the building. I have been recording this since Sept 23 2005, and the shape has taken a nice elongated figure 8 shape (infinity symbol).
This coming Friday and Saturday evenings (July 21 & 22) Sydney Observatory is holding its second annual Festival of the Stars. The Sydney Harbour Bridge floodlights will be turned off for the events and a number of City and North Sydney buildings will be turning off their exterior signage.
On Monday 7 August from 6:30 pm there will be a double event at Sydney Observatory. First there will be the opening of a spectacular photographic display. This is from the 2006 "David Malin" Awards that was held during the CWAS Astrofest in July.
Every School Holidays we hold numerous family events. Yesterday we ran our “Lost in Space Family Fun Day”. Aimed at children, all the activities were included in the ticket price of just $10 per child.
Sunspots on the Sun indicate regions of strong activity and magnetic fields. The number of spots tends to vary with a cycle of 11-years called, not surprisingly, the sunspot cycle. In 2006 the Sun is at a minumum in the cycle and there are generally few spots visible.
July's clear nights provide an excellent opportunity to become familiar with the night sky. One of the best ways to do so is to download a monthly sky description from the Sydney Observatory website, go outside with the drink of your choice and an mp3 player and then settle down comfortably to watch the sky and listen to the description.
With these beautiful clear winter days we get plenty of calls about golden "comets" in the early morning or late afternoon. Sadly these celestial delights are nothing more that plane condensation trails reflecting the unscattered longer wavelength light from the sun.
Are these the same object? Q. "Hi im from bateau bay n.s.w.tonight 6.20pm i saw a meteor going from west to east fizzing out over the sea could this be a fragment of yesterdays report of a near miss of a much larger object , my sighting showed a brilliant long tale slow moving" A.
It can be difficult to explain the large scale of our solar system. Diagrams in books invariably are not to scale as the innermost planets like Venus and Earth are so much closer to the Sun than the outer planets like Jupiter and Saturn.
The main camera on the Hubble Space Telescope is the Advanced Camera for Surveys (ACS). In the middle of June power supply problems in the camera forced NASA engineers to shut down the camera to protect the CCD detectors.
Each new moon weekend a group of amateur astronomers from the Sutherland Astronomical Society head to a dark site at Bargo outside Sydney to do some serious observing. Last Saturday (24 June) Les Dalrymple thought that he had discovered an exploding star or supernova.
This Monday evening will be a great time to view the Moon as it is at first quarter phase, the phase when most detail is visible. The amateur group Sydney City Skywatchers will hold a Moon observing practical night at Sydney Observatory on Monday 3 July at 6:30 pm.
Q. John Tebbutt first made his name when he discovered a comet in 1861. Could you give me the official name for this comet? I know Tebbutt's name was in there, there were some numbers as well. Another comet discovered by him twenty years later, has I think the official name, Comet Tebbutt 1881 (III).
On Monday 3 July a space rock with the designation 2004 XP14 will pass relatively close to the Earth. The rock is between half and one kilometres in width, but there is no need to worry as at its closest it will still be 430,000 km away or just over the distance of the Moon from the Earth.
Q. Do you know of anywhere i can get details of the Solar and Lunar azimuth angles from Sydney? As i would like to make a model Stonehenge for the backyard. But of cause I can't use the original layout, being in a different lat.