NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: The *&^%$#@ Moon
From: George Huxtable
Date: 2006 Aug 18, 15:09 -0500
Lars Bergman wrote-
Regarding Robert's trouble with the moon,
... 2. Sometimes it can be very difficult, or actually impossible, to
know
whether the upper or lower limb of the moon is the one to shoot. Then
you'll have to wait an hour or so until the moon has tilted suffiently
to show a clear limb but near full moon it is easy to make mistakes. A
false LL gives a too large altitude, a false UL gives a too small
altitude.
========================
I agree with Lars that it's important to choose the appropriate limb
of the Moon. But in the circumstances he describes, in which the
choice isn't obvious, would one expect to see a significant error if
the wrong one was chosen? Robert Eno was looking for discrepancies of
a few arc-minutes.
=========================
May I comment on Robert's choice of threadname, "The *&^%$~@ Moon",
here? Flippancy in a posting is common, sometimes enjoyable, often
appreciated. However, perhaps it should be resisted when coining
threadnames, which will be sorted by some algorithm, and searched-for
or browsed-for by readers, perhaps way into the future. I suggest that
posters should take some care to make the threadname relevant to the
topic in question (and change it when discussion veers into a new
direction.).
George.
contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
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From: George Huxtable
Date: 2006 Aug 18, 15:09 -0500
Lars Bergman wrote-
Regarding Robert's trouble with the moon,
... 2. Sometimes it can be very difficult, or actually impossible, to
know
whether the upper or lower limb of the moon is the one to shoot. Then
you'll have to wait an hour or so until the moon has tilted suffiently
to show a clear limb but near full moon it is easy to make mistakes. A
false LL gives a too large altitude, a false UL gives a too small
altitude.
========================
I agree with Lars that it's important to choose the appropriate limb
of the Moon. But in the circumstances he describes, in which the
choice isn't obvious, would one expect to see a significant error if
the wrong one was chosen? Robert Eno was looking for discrepancies of
a few arc-minutes.
=========================
May I comment on Robert's choice of threadname, "The *&^%$~@ Moon",
here? Flippancy in a posting is common, sometimes enjoyable, often
appreciated. However, perhaps it should be resisted when coining
threadnames, which will be sorted by some algorithm, and searched-for
or browsed-for by readers, perhaps way into the future. I suggest that
posters should take some care to make the threadname relevant to the
topic in question (and change it when discussion veers into a new
direction.).
George.
contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
