Some new items (all in already built sundials):
- The seasonal or temporary hours
- The canonical time
- The sideral time
- The instant when a given star or constellation transits
- The planetary hours
- The beginning of the Zodiacal
On a sundial shaped for that purpose, you can read where in the earth, the sun
at that moment, is in the zenith.
See on my website the sundial in Maaseik in Flanders (Belgium):
http://www.wijzerweb.be/maaseik002A.html
Click on the little pictures to enlarge them.
Willy Leenders
Hasselt in
Message -
From: Gianni Ferrari
To: LISTA INGLESE
Sent: Wednesday, November 17, 2010 11:02 AM
Subject: Re: What can be calculated with a sun dial?
Some new items (all in already built sundials):
- The seasonal or temporary hours
- The canonical time
This list - together with all the additions - is great !
But, it would be nice to see which of the many items can be done well by a
sundial and how many items would be a 'stretch'. To find the moment of equinox
- for example - is theoretically possible - but in actuality is not realistic
since
The longitude and latitude of the Sun (i.e., the location on the Earth that
the Sun is directly above).
On Wed, Nov 17, 2010 at 8:39 AM, Kevin Karney ke...@karney.com wrote:
This list - together with all the additions - is great !
But, it would be nice to see which of the many items can be
: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de]
Im Auftrag von Kevin Karney
Gesendet: Mittwoch, 17. November 2010 14:40
An: Jos Kint
Cc: sundial@uni-koeln.de
Betreff: Re: What can be calculated with a sun dial?
This list - together with all the additions - is great !
But, it would
; sundial@uni-koeln.de
Sent: Wednesday, November 17, 2010 2:44 PM
Subject: Re: What can be calculated with a sun dial?
The longitude and latitude of the Sun (i.e., the location on the Earth that
the Sun is directly above).
On Wed, Nov 17, 2010 at 8:39 AM, Kevin Karney ke...@karney.com
Dear Willy, Gianni, Kevin, Brad, Harold and all other interested dialists,
Thank you for all the nice suggestions. I will try to incorporate them in my
explorations.
My vertical sun dial measures 128 cm x 231 cm. The top of the gnomon comes 26,5
cm before the table. During 216 days of sun
] On
Behalf Of Jos Kint
Sent: Tuesday, November 16, 2010 2:38 PM
To: sundial@uni-koeln.de
Subject: What can be calculated with a sun dial?
Dear sun dialists,
What can be calculated with a good sun dial? Here is a list of 19 topics.
Can you add some more items?
1. The hour of the day
2. The day
Dear sun dialists,
What can be calculated with a good sun dial? Here is a list of 19 topics. Can
you add some more items?
1. The hour of the day
2. The day of the year.
3. The solar altitude.
4. The solar azimuth.
5. The longitude of the sun dial.
6. The latitude of the sun dial.
7. The moment
A few extra:
The stereographic projection, as used by Oughtred, allows
calculation of the sun's altitude and azimuth at any (day)time on
any date, and conversely, the calculation for which date and time
the sun is at a specific azimuth and altitude. The
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