Part of April's challenge was to observe the major satellites of Jupiter and draw or photograph them then identify which each of them are.  You can also follow this on consecutive nights and note (draw) how the positions of the Galilean Moons change from night to night

Below are perfect examples of the requirements for the challenge by Nathan "Skully" Brookes
April's Challenge
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Nathan submitted the images but I don't believe there was a follow up but if I am wrong I apologise if I have mislaid it.