Relating to or measured from the zenith, describing the angle between two celestial bodies as viewed from a vertical point.
From Arabic 'al-sumut' (paths) → European 'azimuth,' combined with 'di-' (two) and 'zenithal' (relating to the zenith or point directly overhead).
Astronomers use diazenithal measurements to plot star positions—it's a fancy way of saying 'measuring the angle between two stars as seen from straight up overhead,' crucial for old-school celestial navigation.
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