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Sunday 29 January 2023

Lunar X, Y and V and Jupiter's Moons all lined up!

There's a well-known optical effect (or 'clair-obscure' to astronomers!) where the rims of some craters and other lunar features produce the shapes of capital X, Y and V. Tonight the X was only just visible - I was a couple of hours late - but the Y and V were both impressive. Jupiter continues to dominate the southern sky: tonight its three largest moons Ganymede, Io, Europa and Callisto were lined up, two each side!



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