- Original Message -
From: Roger Bailey [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; sundial@rrz.uni-koeln.de
Sent: Saturday, September 11, 1999 6:50 PM
Subject: Re: Formula to calculate sunrise
The easy, elegant formulae that you can use to determine sun rise and set
Hi Warren:
would this work? A polar dial with a world map on the face with moveable
gnomon mounted to a set of hourlines(maybe etched on clear glass) that can
be shifted according to the date?
This is rather hard to expain, but we can discuss it in Hartford.
John Carmichael
on a dial map
Hi Roger,
I am looking forward to hearing your presentation and meeting you at the NASS
meeting. I think Fer has pointed out the need for the negative 1 in your first
equation. I have not seen before the sunrise angle psi of:
Sunrise Path: Cos psi = Sin l / Cos D
I assume l is L for
