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Comet C/2007 N3 (Lulin)

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Author Topic: Comet C/2007 N3 (Lulin)  (Read 22403 times)
brianb
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« Reply #270 on: March 05, 2009, 12:13:29 am »

Quote
A bit offtopic: how to define precisely the FOV of an eyepiece?

If somebody knows a formula, please post it, it will be much useful
Time how long it takes delta Orionis (the top star in the belt) to drift across the whole field through the centre with the drive not running. The eyepiece actual field of view is 1 minute of orc for every 4 seconds. (Delta Orionis is very very close to the celestial equator, so the correction term for declination can be ignored)
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