Hours and Minutes to Angle

https://www.mathcelebrity.com/clockangle.php?num=9%3A20&pl=Clock+Angle

For example 21:20

# 21-12=9 and    
h=9
m=20
echo "((60*$h)+$m)/2" | bc 
280 # = Angle

Because there is 12*60=720 minutes in full circle, so 720/360 is 2.

Little script bin/hma.

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