RE: (meteorobs) Next major shower

To: "'meteorobs@jovian.com'" <meteorobs@jovian.com>
Subject: RE: (meteorobs) Next major shower
From: Wayne T Hally <meteors@eclipsedot net>
Date: Tue, 30 Nov 1999 10:06:41 -0500
Reply-To: meteorobs@jovian.com
Sender: owner-meteorobs@jovian.com
Robert,
	Solar Longitude is basically a description of the date that does not vary 
from year to year. Since our year is approximately 365.25 days, and our 
calendar is 365 days for 3 years, then 366 days for one (With a few minor 
tweaks here and there) the date and time each year do not represent exactly 
the same place in the earth's orbit. So in order to accurately describe our 
position is space, we use Solar Longitude. The orbit is divided into 360 
angular degrees, and zero is set to be the spring equinox. Therefore we can 
know where we are, no matter what the calendar says.
	By the way, the IMO gives the peak at 11UT Dec 14th, Solar Longitude 
262.0, or about sunrise for the eastern US (yea!!)

Wayne

----------
From: 	Robert Gardner[SMTP:rendrag@earthlinkdot net]
Sent: 	Monday, November 29, 1999 11:04 PM
To: 	Meteor Observors
Subject: 	(meteorobs) Next major shower

Just a note that I am sure all subscribers must be aware of. On Tuesday
December 14, 1999 the Geminids shower will occur.  The Observers
Handbook 1999 of the Royal Astronomical Society of Canada gives the
predicted maximum at 18h UT, Solar Longitude of 262.3 degrees with a ZHR
95 (the NAMM calendar says 120).  The Moon is very favorable being only
about a week old, it will set around 23 hour UT depending on your
latitude.
    I still don't know what's the meaning of this solar longitude with
respect to observing meteors. It evidentially tells you where to be at
the peak of the activity of a shower?  I have all kinds of books from
basic astronomy to cosmology, astrometrics to relativity. I have quite a
large library. However no mention of solar longitude.  It can't really
represent the western position of the sun or our recent Leonids would
have been in sunshine at the maximum.  This must seem dumb of me, to
someone who knows the answer.
    By the way if my health and weather are favorable,  I hope to go to
dark skies to observe the Geminids.

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