Relation between FOV and angular distances

[Selina]

I have an astronomy assignment where my class had to look through a telescope and make a sketch of the Orion Nebula. We had to calculate the field of view using the focal length of the eyepiece and all that jazz. However, using the field of view and somehow my sketch, I'm supposed to figure out the angular distance between some of the stars in my sketch. How am I supposed to do this? I was wondering if any of you guys knew of a way to do this. The only values I have are: the focal length of the telescope, the focal length of the eyepiece, the field of view, and of course my sketch. Thanks to anyone that could shed some light on this.

[Johnmore]

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.