Dear Friends,
please to note my new e-mail address from now:
[EMAIL PROTECTED]
Thanks
Nicola Severino
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 and
Hi moondialists:
Here are the results of my observations during the January 20 total lunar
eclipse. We had excellent viewing conditions with low ambient light pollution.
Readability: The gnomon's shadow disappeared when about 3/4 of the moon was
darkened.
Time accuracy: The sundial kept
Hi all,
Please can anyone point me at suitable URL's of basic astronomy, capable of
answering questions of the why does the sun rise in the East and what
causes the seasons? type. I have a contact at the local museum who is
putting together an astonomy/sundial trail for primary schoolchildren
Hello Roger,
Welcome back--you've been missed. And thank you for the very
interesting account of your investigations at Chichen Itza.
Best wishes,
Mac
A highlight of my recent trip to Mexico was the Mayan ruins at Chichen
Itza, in particular, El Castillo, the Temple of Kukulcan. This great
pyramid is designed to mark the yearly cycle of the sun. Each of the four
faces represents a season. Each of the four stairs has 91 steps, the number
of days
There is an error in the formula for Substyle Distance in the original
posting. I transcribed from my rough notes incorrectly. The correct
formula, from Waugh, is Tan SD = Sin Dec / Tan Lat. With the latitude of
20.666 and wall declination of 18 this solves to the angle I quoted, 39.32
degrees.
Hi Roger,
The Mayan pyramid sounds interesting. Thanks for posting. I had a problem
with the link in your message. I did find the following:
http://www.mont-acad.pvt.k12.al.us/projects/civ/beau/temp.html
I am still trying to picture how the snake image is produced. You did give a
good
Hi Roger,
This is the link to the ruins with the two //
http://www.piramideinn.com/equinox.htm
Warren Thom,
Roger Bailey wrote:
The light and shadow phenomenon of the equinox is world famous. See
http:www.piramideinn.com/equinox.htm. The corners of the nine platforms
