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    Re: Ulugh Beg's sextant
    From: Casey McMullen
    Date: 2006 Mar 24, 13:30 -0800

    How about:
    > -----Original Message-----
    > From: Royer, Doug [mailto:Doug.Royer@REMECRDS.COM]
    > Sent: Friday, March 24, 2006 1:21 PM
    > Subject: FW: Re: Ulugh Beg's sextant
    > Let's try:
    > http://silkpress.com/archive/discovery/autmn2005/ulugbek.shtml
    > Thanks Fred. Helps if one does a search under the proper
    > title to get results.
    > I now know what this sextant looks like and how it was used.
    > Interesting.
    > Here's a link for anyone interested:
    > http://silkpress.com/archive/discovery/autumn2005.ulugbek.shtml
    > Doug,
    > I can't help you out much with most of your questions, but
    > one comment is that the device probably was not a sextant in
    > that it probably did not employ the double reflection
    > principle.  I would expect it was a sighting tube of some
    > kind, oriented in the north- south axis, which could be
    > pointed at various elevations to read off the meridian
    > altitude of a star directly.  A quick Google search confirmed
    > this conjecture.
    > Fred
    > On Mar 24, 2006, at 1:35 PM, Royer, Doug wrote:
    > > Ok, I'm now reading a very good book dealing with
    > observatories past
    > > and present.
    > >
    > > There is an interesting chapter on the Samarkand Observatory in
    > > Uzbekistan that Ulugh Beg built and used for astronomical
    > observations
    > > in the 1400's.
    > >
    > > There is a crude description of the FAKHRI SEXTANT used by the
    > > Samarkand Observatory that was used to measure the position of
    > > thousands of stars to within a few seconds of arc. It has a
    > radius of
    > > 120 ft.
    > >
    > > After a quick search on the web today for pictures or a better
    > > description of this sextant I came up dry. There are a few
    > pictures of
    > > parts of the observatory but none that are identified as the Fakhri
    > > sextant.
    > >
    > > There is 1 picture of a section of a structure which has 1 vertical
    > > stone wall on each side of a center groove and 2 stone
    > tracks running
    > > in a vertical arc between the 2 walls on either side of the center
    > > groove.
    > >
    > > I had pictured this "sextant" as kind of matching how Stonehenge is
    > > constructed for celestial observations. But now I'm more interested
    > > than ever to find what this "sextant" really looks like.
    > >
    > > Frank, because you're an astronomer, can you help or point
    > me in the
    > > proper direction to get a better understanding of what this looks
    > > like? Visually or at least a better written description. Or
    > can anyone
    > > else help out in this quest?
    > >
    > >
    > >
    > >

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