Thank you, thank you, thank you :)
I thought this could be it but Latin confused me.
Darek
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
East and west can sometimes be pretty flexible. As a ship's navigator
long ago I was regularly asked by a delegate from our Muslim crew which
side Mecca was, so that they could pray correctly. "Port" or "starboard"
was sufficient answer.
Frank 55N 1W
Dear Gianni,
You give us a deligthful story.
I have a problem...
> ... the poles are singular points!
Yes, but these singular points do not
keep still!
> ...to keep always vertical without
> any movement...
Unfortunately, "polar wandering"
means that Mr Thin would have to
keep moving to stay
Of course I meant the "Latitude circle" around the Equator, not the
"longitude circle" in:
"And at the Equator, would the Longitude circle be the biggest circle of
them
all,"
Roderick.
-Original Message-
From: R Wall ml
Sent: Thursday, April 11, 2013 1:23 PM
To: David Patte ₯ ; sun
Some years ago (1999) there was a short discussion, on Italian Mailing
List, on the sundials at the Pole: I tried to translate in (very bad)
English my considerations, that I sent also to the List
sundial@uni-koeln.de
I send again hoping not to bore those who have already read them and also
Direction of Mecca – A simple method
In any place in the northern hemisphere you can find the exact direction of
Mecca (qibla) by observing the direction of the Sun at the moment when it is
at zenith of Mecca itself.
We must observe the Sun on the day when its declination is equal to the
latitude o
The oblateness of the earth is about 1/298.
The Wikipedia page on the figure of the earth
is here: http://en.wikipedia.org/wiki/Figure_of_the_Earth
Here's another page on the shape of the earth:
http://en.wikipedia.org/wiki/Earth_radius
The WGS-84 ellipsoid gives the equitorial radius as
6378 km
