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May Sky

A slight change of title this month, as I will concentrate on the transit of Mercury on May 9. A transit is the term used when a celestial object passes in front of a bigger one from the relevant view point, and can therefore at least in theory be seen against the bigger object's disc. In the solar system, the most commonly observed transits are those of Jupiter's four Gallilean moons, which frequently pass in front of Jupiter from our viewpoint -  though  spotting them is another matter, even when you know they are there! (If the object passing in front is comparable in apparent size to the object...

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