Hello As a french sundialler I can't give you any information on R. Chaleat, but as for the difference between meridian crossing and culmination, I know that in 1988 D. Savoie wrote an interesting paper on the subject in "Observations et Travaux" published by the SociČtČ Astronomique de France (N14/15, 1988, p3-8). As far as I remember the difference lies in the fact that because of the increase (decrease) in sun's declination during a day, the sun can be a little bit higher in the sky a few minutes after (before) noon . The effect is more important at equinoxes but is always pretty slight.
Regards Jean-Paul Cornec Lannion France 4844'20" N 327'32" W Cadrans Solaires de Bretagne : http://perso.wanadoo.fr/jean-paul.cornec/index.html ----- Original Message ----- From: Alain MORY <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, June 16, 2001 10:25 PM Subject: meridian or culmination ? > > Hello, > > I was surprised to sea a software dedicated for astronomy showing other > times for "passage au mČridien" and for "culmination" of the sun. > > Why is there such a difference between these two notions ? > > Alain MORY > 48N 7E
