Moreover, simply *rotating* the sundial will not correctly apply a
longitude correction; the hour lines must be re-calculated to maintain
accuracy. So, it is better to simply make the correction arithmetically
(constant throughout the year).
Larry
On 2/9/2011 2:05 PM, Willy Leenders wrote:
Make no effort, Donald.
Let your sundial be a sundial.
The longitude correction turns your sundial to a watch.
But you've already a watch.
Solar time - you do'nt have it - can only be given by your uncorrected
sundial.
Willy Leenders
Hasselt in Flanders (Belgium)
Visit my website about the sundials in the province of Limburg
(Flanders) with a section 'worth knowing about sundials' (mostly in
Dutch): http://www.wijzerweb.be
Op 9-feb-2011, om 22:49 heeft Donald Christensen het volgende geschreven:
How do I design a longitude correction in my sundial?
Correct me if I'm wrong
My horizontal dial is for Brisbane. The longitude is 153 deg and the
standard meridian is 150. This is a 3 deg difference.
I'll then rotate the hour lines by 3 deg to compensate
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Cheers
Donald
0423 102 090
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So there!
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Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
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