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Thanks for the reply.

That clears up the matter.

When I go back and look at previous sights, and note the comments I
have made, the sights that show a greater error indicate that the moon
is very faint or I am getting close to the end of the range of usable
lunar distances your online program shows.

When I take shots with a nearly full moon with crystal blue sky the
results reliably come in +/- 0.1' or so. Stars and planets seem to
have a little more spread but I have not had the same issue with the
smaller crescent moon and sun.

I tend to use the 2X monocular mainly because using the 12X inverting
scope is such a bear to use. Even though I don't get the precision the
average seems to work out well and even with the 2X, the spread in the
sights is normally around +/- 0.2'.

I have thought of getting another scope but in reality the 2X is the
most practical when actually sailing.

Besides sextant range, what other criteria does your online program
use for predicted usable lunars?

Jim

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