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1 hr of RA = 15 degrees, not 1 hr of arc. RA is a measure based on time, ie the time it takes to rotate 360 degrees. 2 different units of measure. So 1 min of RA is not equal to 1 arc minute but 15 arc minutes and 1 sec in RA is not 1 arc second but 15 arc seconds. Declination on the other hand is measured in degrees.
Cheers
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