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Another way to look at things is to make a picture of the object. If it is on A4 paper and you hold it a tad more than 30 cm away, the magnification shown in the picture is (approximately) 40 divided by the angular width of sky shown on the short side, so for example, if the moon just fills the short side of the paper (20cm), the mag is 80 (40/0.5).
What I mean here by "magnification" is that if you hold the pic of the moon up to the sky at 30 cm from your eye, it will span 40 degrees, which is 80 times more than the real moon.
Geoff
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