Hi Rudolf, It was my suggestion. I had a tee shirt made up and wore it at the NASS conference last year. At the NASS conference in Hartford next month I will expand the topic to a full presentation called "Sunset Phenomena - How simplified spherical trigonometry can be used to determine when, where and how the sun sets". This is why I had the formulae at hand. I plan end the talk with a revised tee shirt design including the three formulae for when, where and how the sun rises or sets.
I am glad you liked the idea and made up a tee shirt. Roger Bailey N 51 W 115 At 07:46 PM 9/11/99 +0200, you wrote: > >> ----- 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 >> phenomena are: >> >> Sunrise time t: Cos t = Tan L x Tan D >> Sunrise location: Cos Z = Sin D / Cos L >> Sunrise Path: Cos psi = Sin l / Cos D > > >About a year and a half ago, someone suggested this formula (the top one) >should be on a T-shirt. >I cannot look up who it was, as that mail is on a computer at my former >employer (don't worry, got a better job). > >Well, I actually had a T shirt made, with a picture of a sunset on it, and >that very formula. > >Lay people look startled when they see it; dialists grin and nod. > >It's a little like the Scottish eleven-forty-two cannon, a little like a >noon cannon except it fires at eleven fortytwo. Tourist leap in the air, but >locals grin and nod- that's how they keep them apart. > >---- > >Argh! I have been sending HTML mail all this time! It came with the mail >program but I never read the manual. >I have switched it off now. > >---- > >May your shadows be always to the point. >Rudolf > > >
