Hello
John ,
the
values written by Carol are all correct and very accurate and her wall faces
exactly 1 deg 13 8 west of south
In
astronomy the azimuth values start from north and therefore a value of 209 deg corresponds, for the dialist, to
29 degs from South toward West.
Regards
Gianni Ferrari
44° 39' N 10° 55'
E
Mailto : [EMAIL PROTECTED]
----- Original Message -----
Sent: Monday, November 29, 2004 2:55
PM
Subject: Wall Declination
Measurement
Hello Carol: (c.c Sundial List)
I'm back home and this morning I'm looking at
your wall declination measurements. Unfortunately, I am not accustomed
to using the nail method you used and I hesitate to comment because I don't
want to make a mistake. I have heard of this method however. I am
going to forward your letter to our Sundial List discussion group and
hopefully somebody there will be able to check your measurements.
But I was able to check your solar azimuth data
that you got from your astronomy program. According to the program I use
(The Dialist Companion), the solar azimuth at that latitude, longitude and
time was about 20.45 degrees west of south, not 209 degrees. Just think
about it. If the solar declination were 180 degrees west of south, the
sun would be due north and that's not possible. 209 degrees would be
towards the North East which is also impossible.
Hopefully, somebody from the sundial list will
help us.
John
----- Original Message -----
Sent: Monday, November 22, 2004 1:09
PM
Subject: declination
John, I was just having a go at measuring the declination of a window
in my house - I am not convinced of the accuracy of my measurement of sun
angle to wall,but I wondered if you could double check the calcualtions? The
window was approx south facing.
22 nov 2004 at14.01 gmt
I used a nail 92mm long on a vertical board and its shadow was 50mm to
the right of the nail. So the sun angle to the wall is 28 deg 31min 23sec
west of south.
My astronomy program gave me azimuth of sun to be 209 deg 44min 31sec
ie 29deg 44min 31sec west of south, for lat 51deg 25min 20sec North and long
2 deg 42 min 30 sec west.
So I reckon the the wall faces 1 deg 13 min 8 sec west of south??
Regards and hope you dont mind my asking you about this,
Carol
Carol Arnold
Stained glass artist, commissions welcome,
Moving house? Beach bar in Thailand? New Wardrobe?
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