Re: Statue and sundial

[MMB]

 
A non-member of the List has asked me to forward this question:
 
"I have a picture of an 18th century print of a plaster and lathe arch 
which was constructed to celebrate an election victory on Worcester 
[UK], replete with symbolism and classical references.  On one side of 
the pediment is a statue of a female figure leaning against a pedestal 
with a sundial on top.  The statue is paired with one of Liberty 
(blindfolded and with scales of justice) on the other side.  I wonder 
if the sundial statue might be of Clio.  Do any of your sundial 
collegues know of similar classical statues with sundials, who the 
figure might be, or what is symbolised?"


Have a look at this site:

It shows Clio with a clock face so the connection is there between 
History and a symbol of time.



Maria Brandl
Australia

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Statue and sundial

[JOHN DAVIS]

Dear Dialling Colleagues,
 
A non-member of the List has asked me to forward this question:
 
"I have a picture of an 18th century print of a plaster and lathe arch which was constructed to celebrate an election victory on Worcester [UK], replete with symbolism and classical references.  On one side of the pediment is a statue of a female figure leaning against a pedestal with a sundial on top.  The statue is paired with one of Liberty (blindfolded and with scales of justice) on the other side.  I wonder if the sundial statue might be of Clio.  Do any of your sundial collegues know of similar classical statues with sundials, who the figure might be, or what is symbolised?"
 
I have a small (9kbyte) jpg of the print which I can forward to those interested (though the sundial is only just visible.
 
Regards,
 
John
Dr J DavisFlowton Dials

RE: Deriving Lat & Lon from Sunrise & Sunset

[Hein]

Hi Rudolf & other shadowwatchers

Not a place for my holidays.
49.37 S 135 W is somewhere half between the south-points of New Zealand and
South-America. The weatherforecast for the region is a sunny day and
temperature about -5 degrees Celsius. A cold place at sea, but perhaps we
can see the sunrise and the sunset when it is not too hazy.

Hein van Winkel
52 05 N  4 24 E

-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Namens R.Hooijenga
Verzonden: maandag 13 juni 2005 23:21
Aan: sundial@rrz.uni-koeln.de
Onderwerp: RE: Deriving Lat & Lon from Sunrise & Sunset

Hello sundialeers,

I think I could guess the basics behind the method Brooke describes.

>From sunrise and sunset, get noon. True noon,corrected with EOT and
expressed in UTC, would give you longitude, thus: 

NOON(utc) - 12 hours = (degrees WEST) / 15

>From sunset and sunrise, we also have the half daylight length t, for which
we have our T-shirt formula:

- cos(t) = tan(decl) tan(lat)

which we solve for lat.

How sunset and sunrise are determined, I don't know (yes, a photocell, but
what constitutes "sunset"? In Holland, it does not get dark anytime during
the night, this time of year - then again, it certainly is a lot darker that
during the day, even if it is raining again).


Example
Assume we see a sunrise at 17:00 utc and a sunset at 01:00 (which is
conveniently written as 25:00); we get

noon = (25+17)/2 = 21.00 utc.
eot is about zero today (June 13), so we get corrected noon is also 21.00
utc
longitude = (15*21 -12) degs West, or 135 degs West.

Also, t = (25-17)/2 = 4 hours.
Now the half day length is 4 hours, corresponding to 60 degrees.
The declination of the sun is 23.23 degrees north today, so:

- cos (60) = tan(23.23) tan(lat)
-0.5 = 0.429 tan (lat), so that tan (lat) = -1.166 and finally lat = -49.37
degrees, or 49.37 degs South

Our animal was at 49.37 South, 135 West today - wherever that may be.

Rudolf



-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Namens Brooke Clarke
Verzonden: maandag 13 juni 2005 21:06
Aan: sundial@rrz.uni-koeln.de
Onderwerp: Deriving Lat & Lon from Sunrise & Sunset

Hi:

There is an animal tracking system that records the times of sunrise and
sunset (along with the date and time) and then sends that (and some other
stuff) to a central station.  In the central station they process the
sunrise and sunset times to find out the Lat and Lon of the animal (maybe to
1 degree).


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