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 2022 March 20 is the date of the March equinox and is also the first day of spring (or the first day of autumn if you're one of my readers in the Southern Hemisphere). In this post I’ll talk about the equinoxes and discuss the commonly held, but incorrect, view, that they are the… Continue reading The equinox 20 March 2022
There have been stories in the news recently that NASA intend to deorbit the International Space Station (ISS) in 2031. They are largely based upon a recent NASA report outlining the future of the ISS. This report makes interesting reading and describes how NASA will transition away from the ISS towards commercial space stations (which… Continue reading The end of the International Space Station?
Updated 16 December 2025 Even though the Moon is far smaller and less massive than the Earth its gravitational field still has significant effects on our planet. The most noticeable of these are tides, the periodic rise and fall of sea levels. In this post I'll give an overview of the causes of tides. This… Continue reading Overview of tides
Happy new year to all my readers! Shortly after most of Europe and North America moved back to winter time from Daylight Saving Time, I created a poll to see how my readers living in these regions felt about the switch. Now that we’ve entered the new year, I’ve decided to close the poll and… Continue reading Happy New year 2022
Explaining Science 