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You may want to try http://www.celnav.de/page3.htm and download
ICE.ZIP.  I have never experienced a problem with it.  There are
many other applications at this URL that may also be useful to some
of you.

The DOS based ICE files are compressed of course and very small
by todays standards.  This application provides ephemeris data from
1800 to 2045.  ICE can use other star catalogs if needed.

I think ICE may still be commercially available for a few dollars but I
did not research that.  You might check with Celestaire or Willmann-
Bell, Inc. for it.  Purchase the latest version of MICA if you really
want to get the best.  MICA (covers shorter time period, 15 years?)
is more accurate than ICE (covers about 250 years) but ICE is more
than adequate for navigation.


You may want to visit http://aa.usno.navy.mil and look at software
for more information on MICA.  Someone recently mention that
MICA is online but not downloadable.  Also take a look at
http://www.lsrp.com/stars.html.

Perhaps someone will evaluate the various almanac offerings and
report their findings to the list.  We need a set of FAQs for the list
that covers the major topics that get discussed.  Each FAQ should
be kept up to date and possible posted on the list weekly.

Frank J.
Rochester, NY




Date sent:              Sun, 21 May 2006 06:55:09 -0400
Send reply to:          Navigation Mailing List 
From:                   Robert Gainer 
Organization:           Fisheries Trust
Subject:                Re: Silicon Sea
To:                     NAVIGATION-L@LISTSERV.WEBKAHUNA.COM

For our purpose I think it would be better to make copies of the
relevant pages from the Nautical Almanac. The end use is to
provide a
lookup table to solve workbook problems. So part of the learning
experience it to find the data in the actual pages. Does Mystic keep
old Almanacs? Who might have out of date books like this? Thanks,
Robert Gainer

>
> From: Alexandre E Eremenko 
> Date: 2006/05/21 Sun AM 05:46:24 EDT
> To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
> Subject: Re: Silicon Sea
>
> > As far as I know, everyone uses the algorithms described by Jean
> > Meeus. I seem to remember that at least one list contributor
> > calculates data as needed directly, for virtually any date in the
> > past or future.
>
> I remember an old discussion on the Nav-L list on the best method of
> generating an almanac. Using Meeus seems (to me) very hard and time
> consuming (his formulas contain many terms and one has to input a
> lot of numerical coefficients). As I remember, Frank proposed a
> simpler solution: downolading all ready data from some site on the
> web. This was a large file. Frank never said however how his own
> almanac works, whether it uses pre-computed data, or computes each
> time by Meeus's or similar formulas.
>
> Alex.
>

   

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