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This page has been tagged, without any explanation
Please explain why it is:
Non-notable: the term has produced 70,000 google hits, so someone has heard of it
Neologism:   I cannot see any word here that isn’t in a dictionary
Requiring references: There are 3 external links on this page; and both of these,  “35 Who Made a Difference” and  Amateur Astronomy's Revolutionary on the John Dobson page refer to “Sidewalk astronomy”. At least one of them should qualify as a reliable 3rd party source.