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Hi Richard,
I prefer decimals as well for measurements, but for astronomy, this concept of minutes and seconds is a bit harder since its in a scale of 0 to 60.
so when you look at the alt/az co-ordinates say in stellarium, that gives it to you in deg, min, sec.
not sure how you look for 21d 9m in decimals - is it 21.15deg?
my problem is converting the 1/10 vernier scale back to minutes or vice versa.
so 21deg 0.5 on the vernier scale would need to be converted to minutes, 0.5 * 60 = 30mins or 5 * 6 = 30mins if i'm not mistaken.
but if the scale was 1/12 and 0 to 60, that makes it very easy as each division is 5 minutes.
then you'd just need to watch the vernier scale till 30 lines up.
sorry if it looks like I'm asking for too much, but just my thoughts.
if its difficult, pls don't worry about it. this is ample.
i'll build a jig for the vernier anyway.
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