There is no equivalence.
A millimetre is a measure of linear displacement in 1-dimensional space while a minute of degree is a measure of angular displacement in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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60
1 degree = 60 minutes 1 minute = 60 seconds 1 degree = 3,600 seconds
there are 60 seconds in one minute. An arc minute is 1/60 degree and an arc second is 1/3600 degree
An arc-minute is 1/60 of a degree. It is not a measure of length, so you can't convert it to inches.
1 foot is 304.8 millimeters.