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Thanks Bert, just what I was looking for! This all came about when I created a script that makes the digital system in the planetarium simulate both a lunar synodic month and then a lunar sidereal month to show the school kids the difference. I then, for fun, made the Moon leave a trail and I was suprised to see an analemma. When I remember to bring the camera into to work I'll take an image - but it wont be anywhere near as good as that APOD.
Peter.
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