Dear John,
The manufacturer told me, that the sundial has been calculated for the
ASTRA-TV-satellite system, which carries a lot of middle European
TV-stations, on 19.2° East in an geoorbital position and the city of
Frankfurt on the Main river.
Best regards
Josef Pastor
_______________________________________
-----Ursprüngliche Nachricht-----
Von: JOHN DAVIS [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 27. November 2008 14:34
An: 'Sonnenuhr (Uni Köln)'; Josef Pastor
Betreff: Re: Satellite Antenna Sundial
Dear Josef and dialling colleagues,
Thank you for this most interesting information.
I actually made a satellite dish sundial in 1999. The story was published
in the British Sundial Society Bulletin, 11(ii), pp.77-80 (June 1999). I
even used the same motto - Carpe Diem - as is on one of the two commercial
versions. I should have patented the idea!
I believe the commercial dials probably have adjustable gnomons. Whilst the
hourlines should also change with the location of the dial and which
satellite it is aligned to, it probably is not too inaccurate to have a
fixed set of lines for a small geographic area. One of the advantages of the
geostationary orbits of broadcast satellites is that they are mainly in
quite a small portion of the sky.
I would be most interested in any further information you can obtain from
the manufacturers.
Regards,
John Davis
-----------------------------
Dr J Davis
Flowton Dials
--- On Thu, 27/11/08, Josef Pastor <[EMAIL PROTECTED]> wrote:
From: Josef Pastor <[EMAIL PROTECTED]>
Subject: Satellite Antenna Sundial
To: "'Sonnenuhr (Uni Köln)'" <[email protected]>
Date: Thursday, 27 November, 2008, 11:51 AM
Dear Dialists,
the "German Satellite TV Sets - producer" FUBA from Muenster/Westphalia
offers actually a special edition of "parabolic sundial satellite antennas".
Two versions are available. These have an diameter of 85 cm. For the
technical details look at:
http://shop.fuba.de/index.php?cat=c1816859_85-cm-Klasse.html
Best regards
Josef Pastor
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