Markarian 21 (Galaxy cluster)
From Cambridge , Markarian 21 will become visible at around 20:49 (EDT), 73° above your northern horizon, as dusk fades to darkness. It will then sink towards the horizon, becoming tricky to observe after 04:19 when it dips 21° above your north-western horizon.
Name
Markarian 21
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Object type
Galaxy cluster
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All times shown in Cambridge local time.