Greetings, fellow dialists, So many clever solutions! I am no mathematician but I suppose I am in duty bound to add my two pennyworth to the sunset problem. If 90 deg is added to the angle Pole-Paris-London (obtainable from given) then this angle is the internal angle of Pole-Paris-Sun. The sides Pole-Paris and Paris-Sun are known and Pole-Sun may be calculated to give the sun's declination.
The 90 deg angle is because the arc Paris-London is part of the great circle whose centre is the sun and Paris-Sun is a radius and so forms a right angle to the circle. OK, where did I go wrong (don't all rush). I may say I think it an unfair question for pilots being examined in navigation but it happened to my brother-in-law who was flying with KLM in 1949. Frank 55N 1W -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.9.1/854 - Release Date: 19/06/2007 13:12 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
