Frank,
>
> The key paragraph in your note is:
>
>
> "I use this order because both rotations are
> about axes IN THE PLANE being used. This
> keeps rotation matrices simple and so on."
>
> There is no real need to do one before the other - unless you are concerned
> about making the matrix manipu
I am at a quick stop while on itinerary. Somewhere you have to address N and S
as a basis for declination, ad then E or W. And somewhere you have the
inclination. Thus there should be no confusion.
"S 45°W inclined 20°" for example.
Chapter 18, pages 171 to 202 of Illustrating More Shadows dis
I am at a quick stop while on itinerary. Somewhere you have to address N and S
as a basis for declination, ad then E or W. And somewhere you have the
inclination. Thus there should be no confusion.
"S 45°W inclined 20°" for example.
Chapter 18, pages 171 to 202 of Illustrating More Shadows dis
Dear Fer,
Thank you for your message. Your procedure
is almost exactly like mine. I also start
with the equatorial plane (I missed that
step out in my message). I then:
1. Rotate by phi (to make the plane vertical)
2. Rotate by Azimuth (to face the plane in the
I would like to contact Klaus Eichholz by email. If he is a reader of this
list, or if anyone has his current email address, please contact me off-list.
Thank you.
Sara
Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific
Instruments
Department of the H
Frank,
At our website
http://www.de-zonnewijzerkring.nl
you may read the procedure I use in my program ZW2000 to calculate sundials.
Follow:
calculate and construct
flat sundials - extensive version
main procedure
I start with the sun's position relative to the equatorial plane, given by
decl an
Well, it's "Dec then Inc" for me - though I only have limited experience with
inclined dial design. Hmmm, I hadn't ever really rationalised it as you have.
An excellent topic.
Thanks Frank
-Original Message-
From: Frank King
To: sundial
Sent: Tue, Aug 31, 2010 3:37 am
Subject: De
Dear collegues,
here I am again hoping not boring you. A friend noticed me that in my last
e-mail still using the word "fund" I am not been clear again but maybe I have
generated again confusion in the minds of English speaking people.
I suppose that the majority of you has it clear what I was t
