Hello Bill, ( and others )
Thanks for your suggestion to use a cord to find the correct intersection
point between a date line and the shadow line in an azimuthal dial.
Although my program Spin is restricted to latitudes outside the tropics I
calculated such a dial for latitude 0 degrees
I've got your point. Thank you.
As always, I tried to locate this "Mayall and Mayall". The only thing
I found was "The Sky Observer's Guide : A Handbook for Amateur
Astronomers"
by Robert Newton Mayall, Margaret W. Mayall (Illustrator),
Jerome Wyckoff
which certainly is not the one you've
Dear Fernando,
You don't need a nodus, but just a vertical rod in the center.
Read where the shadow of the rod intersects the circle of the proper
date.
At low latitude this type of dial isn't very useful.
Best, Fer.
Maybe with a very tall rod?
- fernando
Beginning on p.180 of SUNDIALS
also may name this type of dial an azimuthal dial. Can you give
me a mental (or real!) image of this dial? I had never tried 'spin'
before, and the result is, to say the least, interesting! Is this
basically a flat dial, with a vertical style and nodus? How would one
derive the height from
a
vertical
> > style.
> > You also may name this type of
dial an azimuthal dial.
>
> Can you give me a mental (or real!)
image of this dial? I had never tried
> 'spin' before, and the result is,
to say the least, interesting! Is this
> basically a flat dial, with a vertic
"fer j. de vries" wrote:
At low latitude
this type of dial isn't very useful.
Maybe with a very tall rod?
- fernando
--
Fernando Cabral
Padrao iX Sistemas Abertos
mailto:[EMAIL PROTECTED]
http://www.pix.com.br
Fone Direto: +55 61 329-0206
mailto:[EMAIL PROTECTED]
PABX: +55 61 329-0202
Fax: +55
of math taught there,
though.
Have a great day!
ryan weh
- Original Message -
From:
fer j. de vries
To: sundial
Sent: Thursday, January 20, 2000 11:47
AM
Subject: Azimuthal dial
Hello Dave,Attached ia an example of such
a dial.Spin means spider.The dial
