Crossword Genius

Horizon arc (7)

Ross

I believe the answer is:

azimuth

(Other definitions for azimuth that I've seen before include "heading for a star" , "Angular distance in astronomical navigation" , "Astronomical angle --" , "Horiz. angle (of compass bearing)" , "Angle flat out" .)

I've seen this clue in The Guardian, The Times and The Sunday Times.
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