Recent postings to the sundial list have pointed out that on the equinox,
the path of a shadow cast on a horizontal surface is a straight line
oriented west to east. Only on the equinox is the path of any shadow a
straight line. When the shadow is cast on other planes, it is still a
straight line
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
