How about the dip angle which is there because your eye is not at ground level and the calculations think you are!
Dipangle(in minutes of arc)=1.06*SQRT(ht in feet) Dipangle(in minutes of arc)=1.92*SQRT(ht in meters) I guess this will help you Thibaud Chabot At 15:55 30-1-99 +0000, you wrote: -----Original Message/Oorspronkelijk bericht-------------- >Hi John and others in the golden west, > >You make the case that the sun truly sets earlier than it appears to do. >If, as you say, 34 minutes of arc represents 2.26 minutes of delayed >sunset time due to refraction, we are getting into seconds. In that >case we must do what the Nautical Almanac does not, and consider the >height of the observer's eye. > >The late Mr. E.W. Barlow, a meteorologist in the British Met. Office >once told me that while serving aboard one of the ocean weather ships he >saw the green flash (visible under very clear conditions at the moment >of sunset) three times at a single setting. This he said he achieved by >moving to successively higher decks as the sun went down. > >Pondering this, I have reckoned that if the decks were, say, ten feet >apart he would have about four seconds to move from one deck to the >next. I wonder if, being prepared, such a feat would be possible and >whether anyone else has ever attempted it. Or was he just hauling my >leg? >Frank > > >-- >Frank Evans > ----------------------------------------------------------------- Thibaud Taudin-Chabot, home email: [EMAIL PROTECTED] (attachments max 500kB, in case of larger attachments contact me)
