Many of you will have seen the images back in 2019 which showed long ‘trains’ composed of up to sixty SpaceX Starlink satellites crossing the sky in a straight line. These pictures hit the headlines not only because of the number of satellites, but because of their brightness. A 'train' of SpaceX Starlink satellites,… Continue reading Effects of Large Satellite Constellations on Astronomy
In this post I will talk about the work of the International Dark-Sky Association (https://www.darksky.org/)and the visit I made a few years ago to the Kielder Observatory, which is in the Northumberland Dark Sky park in northern England. The International Dark-Sky Association (IDA) was founded in 1988 by David Crawford a professional astronomer, who spent… Continue reading Dark Sky Places
Updated 16 December 2025 As discussed in my earlier post on Dark Skies , light pollution is a major nuisance to astronomers both amateur and professional. When astronomers classify how much light pollution there is at a particular location, they often use the Bortle Scale, devised by John Bortle and first published in the popular astronomy… Continue reading Measuring and Mapping Light Pollution
Update 16 March 2022- click on the image below to view a video of much of the information in this post https://youtu.be/smCG4mWKjPA 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… Continue reading SpaceX Starlink Satellites (2020)
Watching the Sun set below the horizon and the sky gradually get darker and darker is an almost magical experience. Twilight is that time of the day, just after sunset, or just before sunrise when the Sun is below the horizon but the sky is not completely dark. It is valued by photographers because of the… Continue reading Twilight
Explaining Science 