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A 
 has proposed to his fiancée during an 
 that occurs just once every 6,800 years or so - give or take a 
 or two. John Nicotera, 33, popped the 
 to his now affianced Erica Pendrak, 26, while the Neowise comet passed over their heads. It will be another seven 
 before anyone else can get down on one knee and propose while the 
 body flies overhead. Mr Nicotera is a space 
. He knew the rare astronomical event would take place in the Northern Hemisphere for a limited 
 and planned his proposal to coincide with the comet being 
 in the night sky. The 
 drove to a campsite outside New York last week and John waited for the comet to appear.