NavList:

   

Reply

Marcel Tschudin wrote:
> Paul wrote:
> "With a body of 16' semidiameter, and sea level refraction, this
> decreases the semidiameter about .27". I tested this at several
> altitudes from 10 degrees to 80, and it didn't vary more than .01[sec
> arc]".
> I couldn't figure out how you obtained this value. Looking at it
> geometrically by linear interpolation: about 0.5 deg refraction at the
> horizon and 0 refraction in zenith direction results in a much larger
> value. Looking at it using differential refraction shouldn't result in
> a more or less constant value (0.27"). I would appreciate if you could
> explain the cause of the effect in more detail.

Your values are the vertical refraction. My message was about the
decrease in *horizontal* semidiameter due to refraction.

--
I block messages that contain attachments or HTML.

--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---

   

Reply