NavList:

Here's today's lunars from the Chicago lakefront:
Time(CDT)     LD
18:23:00   41d 13.0'
18:26:55   41d 14.5'
18:29:17   41d 15.5'
18:32:10   41d 16.1

The sextant is an "International Nautical" which is a Tamaya-alike and
nearly identical to an "M.A.C.". The IC is -0.7' and T=90F, P=29.95 in.

I get an average error of -0.2' in the lunar distance (cleared using my
online clearing calculator) which corresponds to about 6.5' of
longitude. Conditions for this lunar were very bad. At 41 degrees
elongation, the Moon should be visible in daylight but I could not see
it at all except using the sextant's 7x telescope, and even then it was
indistinct in hazy skies. Took me about five minutes of waving the
sextant around to find it.

I discovered something interesting, and annoying, about my sextant
while taking these sights. The shade in front of the index mirror does
not completely cover the mirror. There is a small spot left unshaded.
If I move the Sun's image to the far "lower right", I see the Sun
unshaded --which I do not want to do more than once. Fortunately, the
shade has an obvious "foot" which I can file down a little to solve the
problem. The horizon shade had the same problem, but I fixed that one
by unscrewing the whole unit and turning it around.

-FER
www.HistoricalAtlas.com/lunars


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