Surveying the Cosmos – Part II

In a previous post  I talked about the Large Synoptic Survey Telescope (LSST), a large telescope being built in Chile which will spend 90% of its time surveying most of the sky a total of  1000 times over a 10 year period (in the remaining 10% it will revisit areas of specific interest).  In this… Continue reading Surveying the Cosmos – Part II

The Brightness of Venus

Anyone, even the most casual observer,  looking at  the evening sky in the last month will have noticed the brilliant white planet Venus shining in the west. Often known as the Evening Star, Venus is the third brightest natural object in the sky after the Sun and the Moon. In this post I’ll talk about… Continue reading The Brightness of Venus

SpaceX Starlink Satellites

  Update 16 March 2022- click on the image below to view a video of much of the information in this post Many of you will have seenthe pictures in 2019 showing long ‘trains’ composed of as many as sixty SpaceX Starlink satellites crossing the sky. A 'train' of SpaceX Starlink satellites just after their… Continue reading SpaceX Starlink Satellites

The evenings are drawing out already

Although there is still a week to go until the December solstice, the evenings are already starting to draw out. I have decided to re-blog an edited version of my 2015 post on this topic. ------------------------------ As I complete this post, it's completely dark outside and it's only 5 o'clock in the afternoon; most people… Continue reading The evenings are drawing out already

Stellar aberration

This post is a bit more technical than usual and discusses stellar aberration, the apparent movement of stars as a result of the motion of the Earth.  It is an interesting case of the application of the scientific method.  Observations were made to test a scientific theory, but unexpected results were found, which in turn… Continue reading Stellar aberration