Tom Semadeni ([EMAIL PROTECTED]) wrote:
Hi Jim^2,[Sorry, couldn't resist.]
Aren't we trying to lay out marks FROM a computer screen or a piece
of paper TO the real thing on the ground? So aren't we trying to
FIND the radii of the distance circles GIVEN the coordinates of
the target
Ron:
Very cool! Point C is the intersection of two offset circles with centers
at A and B, whose radii is known. I wonder what the exact mathematical
formula for this is? Wouldn't it come out as an (x,y) coordinate?
John Carmichael
http://www.azstarnet.com/~pappas
All,
I'm sorry I was only
: Wednesday, May 26, 1999 7:48 AM
Subject: Re: frame grid method
Ron:
Very cool! Point C is the intersection of two offset circles with centers
at A and B, whose radii is known. I wonder what the exact mathematical
formula for this is? Wouldn't it come out as an (x,y) coordinate?
John Carmichael
@rrz.uni-koeln.de
Date: Tuesday, May 25, 1999 9:45 AM
Subject: frame grid method
Perhaps a precise solution would be to calculate the intersection of the
hour line with the enclosing frame of your sundial. It must be done by a
computer but its easy to give a very good precision.
The result
Hi Jim^2,[Sorry, couldn't resist.]
Aren't we trying to lay out marks FROM a computer screen or a piece of paper TO
the real thing on the ground?
So aren't we trying to FIND the radii of the distance circles GIVEN the
coordinates of the target point and the location of the second reference
I *really* like this scheme. Very clever...
Jim
--- --
| Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] |
| Parametric| Salt Lake City, UT | (801)-588-4632 |
| Technology Corp. | 84108-1202 |
Perhaps a precise solution would be to calculate the intersection of the
hour line with the enclosing frame of your sundial. It must be done by a
computer but its easy to give a very good precision.
The result would be given as a length and a direction (north, east, south,
west side of the
Further to Roy Anthony's note on laying out a large dial.
His method is similar to the one used for the Swenson dial which is 30 by
60 feet. An arm with a scale attached was pivioted at the base of the
gnomon. This was the origin of the original x-y set of points defining the
dial lines.
--
Tom Semadeni O
[EMAIL PROTECTED] o
aka I (Ned) Ames .
Britthome Bounty *
Box 176 Britt ON P0G 1A0
'Phone 705 383 0195 fax 2920
45.768* North 80.600* West
