Updated 30 November 2025 A lot has happened since I wrote a post back in June 2025 about the Artemis programme. At the time it looked like America would be landing astronauts on the Moon in mid-2027. However in October, concerned by delays in SpaceX’s Starship HLS, the NASA Acting Administrator Sean Duffy revealed that… Continue reading NASA’s Artemis Moon Missions Update
Category: Moon
How Libration Reveals some of the Moon’s Far Side
Many people think that the whole of the Moon’s far side is entirely hidden from view. This isn’t quite true. There is a region around the boundary between the near and far sides which is sometimes visible due to a phenomenon called libration. Libration causes the Moon to appear to wobble from side to side and… Continue reading How Libration Reveals some of the Moon’s Far Side
Lunar Stationary Orbits: Why They are Impossible
A friend of mine recently asked me whether it was possible to have a lunar-stationary orbit. This would be the equivalent of a geostationary orbit, but around the Moon rather than the Earth. To an observer on the Moon, a lunar-stationary satellite would appear fixed in the sky and if a dish were pointed… Continue reading Lunar Stationary Orbits: Why They are Impossible
Latitude and Longitude on the Moon and the Planets
Revised 18 December 2025 We're all familiar with specifying a location by its latitude and longitude, but I thought it would be interesting to write a post about latitude and longitude on other bodies in the Solar System. Locations on the surface of the Moon are given a latitude and longitude just like they are… Continue reading Latitude and Longitude on the Moon and the Planets
NASA’s Artemis Moon Missions
In March 2019 the American Vice President Mike Pence surprised many people when he announced an extremely ambitious plan to put American astronauts on the Moon in 2024. NASA named its new crewed Moon programme Artemis, after Apollo’s sister in Greek mythology. Perhaps unsurprisingly, the dates have slipped since this extremely ambitious announcement. After numerous… Continue reading NASA’s Artemis Moon Missions
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