John Carmichael wrote:
Does this mean that there is no upper limit for the size of a
sundial? *
Seems obvious to me. The limitation in most configurations is the fuzziness
of the shadow, which also implies that size doesn't improve precision.
If this is true, then one second
On Mon, 3 May 1999, Phil Pappas wrote:
Does this mean that there is no upper limit for the size of a
sundial? *
Assuming that the fuzziness of the shadow is not a limiting factor for
maximum size, because you can get precise readings using the fuzz zone's
center, then a huge
At 09:23 AM 5/2/99 -0700, you wrote:
Hello Nit Picking Old Timers:
Roger states what we have all thought to be true, that as the
style recedes from the sundial face, the shadow's edge becomes fuzzy which
limits the degree of precision attainable. This effect is most noticible on
large sundials.
Greetings wonderful dialers all !
Regarding Phil Pappas suggestion that the true shadow point is in the
center of the prenumbra, I still have doubts.
I haven't had time to make a shadow sharpener to see if the point is in the
perceived center or not, but in the meantime, I was wondering if
Luke Coletti wrote:
Hello Roger,
Any thoughts on how one should calculate solar coordinates to be most
precise/accurate? Most solar coordinates are computed for the center of
the solar disk, I would like to hear feedback (since I don't believe
this topic has come up yet) on using
Tim Yu wrote:
If what one reads on the Web can be believed, a man named Robert Pershing
Wadlow (b. 2/22/18 in Alton, IL; d. 7/15/40) was 8' 11.5 (2.73 m) when he
died.
Thank you Tim. You've saved my day!
- fernando
--
Fernando Cabral Padrao iX Sistemas Abertos
*CAVEAT EMPTOR: *
*
*
* Long, off-topic and not related to accurate vs. precise.*
* Please, hit the delete buttom if you don't want to get bored. *
Patrick Powers wrote:
Message text written by INTERNET:[EMAIL PROTECTED]
I like to see everybody driving on the right side of the road
(sorry British and followers).
Hmmm, don't forget though that the population of countries who drive on the
left much exceeds that of the countries who
Hello Charles all others:
You're right, the fuzz zone is the prenumbra, not the umbra. (mia culpa)
It seems that we are in agreement that the center of the preumbra is the
place where the shadow of the style's edge would be if the sun were a point
light source, and that this point can be
Hello Charles and all,
I tried your Shadow Sharpener test today and was amazed at the result. I
now see that the small hole acts as the lens of a pinhole camera
projecting the image of the sun onto a plane. I took a piece of cardboard
and punctured a series of holes of different diameters. About
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