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Hi Guys
As a starter, in angular measurement, there are 360 degrees in a whole circle.
1 degree = 60 minutes
1 minute = 60 seconds
Therefore 1 degree = 60 x 60 seconds = 3600 seconds.
If we look at the full Moon, its apparent size is 1/2 degree, that is, it subtends an angle of 1/2 degree.
1/2 degree = 1/2 of 60 minutes = 30 minutes.
To differentiate between minutes and seconds of time, and minutes and seconds of angular measurement, the terms arc minutes (arcmins) and arc seconds (arcsecs) are often used.
Cheers
Dennis
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