NavList:

   

Reply

Doug,

You may have said earlier which sextant you're using with Polarizing shades.
If you did, I missed it?  I've seen some Japanese sextants fitted with them,
but know of no others. To the best of my recollection, Tamaya never offered
them, at least until 1979.

Joel Jacobs
----- Original Message -----
From: "Royer, Doug" 
To: 
Sent: Friday, January 30, 2004 3:55 PM
Subject: Night shots useing refected light


> Peter,I can't explain what causes the phenominon you described.You are
right
> that the true horizon doesn't match the reflection.I've never done one
from
> a small vessel so I can't comment on if the height of eye has anything to
do
> with it either.It does appear mostly on those nights when there is little
> breeze,seas are calm with clear atmospheric conditions.
> On nights with the light from a 3/4 to full moon one can make out  the
> differance between the sea and sky even when the moon's altitude is fairly
> high and quite a large number of degrees in arc either side of the moon's
> azimuth.As the moon gets closer and closer to the horizon(setting and
> opposite when riseing)the reflected line of light gets more and more
intense
> untill the moon's light is refracted enough and the white light turns to
> orange.
> Useing the polarizing shade,sometimes useing both the horizon and index
> polarizing shade or a combination of all the shades if both the light of
the
> moon and the reflected light is strong,helps in seeing the black line you
> mentioned.

   

Reply