Astronomy, Photography and Weather
March 25, 2023, 03:45:35 pm
Welcome, Guest. Please login or register.

Login with username, password and session length
News: IAA lecture programme continues alternate Wednesdays from September - an excellent programme of lectures- Queens University Belfast - Bell Lecture Theatre. Also keep an eye out for the Summer Events
  Home Help Search Gallery Staff List Login Register  

Comet C/2007 N3 (Lulin)

Pages: 1 ... 17 18 [19] 20
Author Topic: Comet C/2007 N3 (Lulin)  (Read 18124 times)
Hero Member
Posts: 1228

View Profile
« Reply #270 on: March 05, 2009, 12:13:29 am »

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)
Report Spam   Logged

Pages: 1 ... 17 18 [19] 20
Jump to:  

Bookmark this site! | Upgrade This Forum
SMF For Free - Create your own Forum

Powered by SMF | SMF © 2016, Simple Machines
Privacy Policy