When you have calculated your field of view - you could measure the diameter of your sketch, then the distance between two stars, and divide them.
For example:-
If your sketch was - say - 6 inches across
And the field of view was - say - one degree
Then you measure the distance between two stars, and it is - say - one inch.
Then you know that they are 1/6th as far apart as your field of view (one degree)
and 1/6th of a degree = 10 arcminutes
These are just simple round figures - your actual measurements may require more complicated maths - but the principle is the same. |