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From: Mike Hannibal (no email)
Date: Mon Dec 05 2005 - 05:43:29 EST
This evening walking back from the supermarket I
noticed a fine opportunity for some lunars - the
crescent moon close to Venus in the western sky at
around 25 to 30 degrees altitude.
I rushed up to "the bridge" - the deck outside our
bedroom - and took a series of 8 lunars. The first in
the series appeared out of range and was discarded. I
cleared the remainder with Frank's calculator. The
results were:
Site # Error in Lunar Error in Lon
2 0 min -0.8 min
3 -0.4 min -11.6 min
4 -1.3 min -37.5 min
5 -0.2 min -7.3 min
6 -0.1 min -2.0 min
7 0 min -0.3 min
8 -0.7 min -22.6 min
From this I deduce a number of things. Firstly if my
interpretation is correct I have a consistent tendency
to not quite bring the bodies into tangency. This
would be borne out by my sense that I had to try to
bring things closer and that the bright "penumbra" for
lack of a better word - around the moon caused me to
prematurely assume tangency. Secondly I am horribly
inconsistent.
Does anyone have suggestions about judging tangency?
Any other suggestions - other than practise - to
improve matters.
Out of interest HE was 14 feet, temperature 70 degrees
F and IE was 0.7 min on. Ds varied from 7d 58.7m to 8d
2.0m.
Regards
Mike
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