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May16-09, 11:18 PM
I was looking at information about the Horsehead nebula on wikipedia
and it says that its apparent dimensions are 8x6 arcmins.
I'm not sure how to find the actual dimensions, say in light-years. Here's how I believe it should be, but I'm sure I'm wrong.
According to wikipedia, the nebula is 1500 ly away. 1 arcmin = 1/60 degrees. So the dimensions should be:
1500*tan(8/60) by 1500*tan(6/60), which is 3.5 ly by 2.6 ly.
Have I got it right, or have I missed something obvious.
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