NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Polaris in daytime
From: Greg Rudzinski
Date: 2012 Jan 25, 16:29 -0800
From: Greg Rudzinski
Date: 2012 Jan 25, 16:29 -0800
Geoffrey,
I use a 4x40mm scope when attempting difficult day time Venus, Jupiter, or Sirius observations.
Greg Rudzinski
[NavList] Re: Polaris in daytime
From: Geoffrey Kolbe
Date: 25 Jan 2012 16:44
Hello Greg
Yes, its photons that counts. If Sirius is 23 times as bright then I
need an object lens that is about 4.7 times the diameter of yours.
(4.7 is the square root of 23)
So, can you tell me how big your object lens is?
Thanks
Geoffrey
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------
