The astrolabe web site URL has changed to www.astrolabes.org. Those of you who
have links to the old URL may want to change it, even though the old one is
supposed to work for at least a year.
Best regards,
Jim
James E. MorrisonAstrolabe web pages at: http://www.astrolabes.org
There have been several notes on the general subject of the reproduction
accuracy of photocopiers and laser printers. Some years ago I had product
management responsibility for IBM's copiers and laser printers so I have a bit
of background in this general area. Technologies change, but the
John,
My French is not what it once was, but I think an épure is just a working
drawing.
Jim
James E. Morrison
Astrolabe web pages at: http://myhouse.com/mc/planet/astrodir/astrolab.htm
- Original Message -
From: John Carmichael [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent:
The astrolabe clock on the Prague City Hall is spectacular.
Best regards,
James E. Morrison
Astrolabe web pages at: http://myhouse.com/mc/planet/astrodir/astrolab.htm
- Original Message -
From: Michael Koblic [EMAIL PROTECTED]
To: Chantale Dumas [EMAIL PROTECTED]
Cc:
I have a desk Space Calendar that has a tear-off page with an outer space
related picture for each date. The picture for April 30, shows the Space
Shuttle on the ground at Edwards Air Force Base with a perfect reflection of
the vehicle in what appears to be a lake. It is not a lake, but a
I am reminded of a particularly relevant cartoon:
An Old Timer is looking over the shoulder of a very young man in what is
obviously an engineering drafting room. The caption was:
I'm not sure about those last eight decimal places, but the first one is
wrong.
Best regards,
Jim
James E.
:24 PM
Subject: bad people on the list
Hello to All.
I hate to start something, but I think that Jim Morrison is a fraud.
I have check his equations for EOT, and I believe that he just made
them up. Here in Brasilia, we have a saying to translate which means,
even a stupid man may
, April 16, 1999 7:18 PM
Subject: Re: EOT=0
Hello JOHN,
I think the difference between my reported time and that given by Jim
Morrison converges very closely the same value, if as I suspect, Jim has
incorporated DeltaT in his calculation i.e., the difference between
Dynamical Time and Universal
I get Julian Date 2451284.52918 which is UT 0:40:57.6 on April 16, 1999. I
think this corresponds to 17:40:57.6 MST on April 15, 1999, in Tucson.
It will be interesting to see what other people come up with.
Best regards,
Jim
James E. Morrison
Astrolabe web pages at:
My wife's uncle was in an artillery battery in the 1st Infantry Division in
W.W.II. I asked him about the use of the sun compass and he said he seemed
to remember that some sort of sundial device was used to locate the
artillery pieces in North Africa where they did not have accurate maps. He
A quick glance at the Rand-McNally, New International Atlas seems to
indicate that a the most populous band is about 20 degrees +/- 5 degrees.
This band includes much of India, Bangladesh, Southern China and Mexico
City.
Number 2 appears to be 45 degrees +/- 5 degrees which includes much of
I want to thank everyone who responded to my request for information on an
historical lunar eclipse. Thanks to Tony Kitto, the correct eclipse was
found to be on September 26/27, 1577.
The Sundial list is a fabulous resource for practical astronomy information.
Best regards,
Jim
James E.
Does anyone out there in sundial land have a source that gives the
circumstances of lunar eclipses in 1582? I am trying to help a young man
with a project related to efforts to determine the longitude of Mexico City
in that time period. We need an eclipse that is visible in both Madrid and
I would appreciate any reference to someone in the UK who is qualified to
make a reproduction of a mariner's astrolabe from the 15th century from
drawings. Such a device would be made of a solid wood disk with a brass
edge and a brass alidade. The reproduction is for a BBC documentary.
Best
Fer de Vries found a small problem in The Electric Astrolabe related to the
calculation of local sidereal time when dynamical time is applied. An
updated version as been placed on the astrolabe web site at
http://myhouse.com/mc/planet/astrodir/electric.htm.
You can download just the updated
Although astrolabes are not sundials in the strictest sense, many sundial
enthusiasts are also interested in astrolabes. I just wanted to let anyone
who is interested know that I have just made a fully animated planetarium
program in the form of a planispheric astrolabe available for free
Stop for a minute.
Stand and enjoy the sun.
Time passes too fast.
James E. Morrison
Astrolabe web pages at: http://myhouse.com/mc/planet/astrodir/astrolab.htm
An invaluable aid to understanding Chaucer's astrolabe treatise is:
North, John D., Chaucer's Universe, Clarendon Press, Oxford (1988).
Chaucer's treatise assumes the reader is familiar with 14th century
cosmology, an assumption that is no longer valid, particularly in the
astrological
The site mentioned below by Angelo Merletti does a wonderful job of creating
an astrolabe like device. It is a form of astrolabe in the sense that any
instrument that uses altitudes to position celestial objects can be called
an astrolabe. It is not, however, the instrument that is usually
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