NavList:

Gary LaPook wrote: No

I’m pleased Gary answered this whilst I was sleeping on it.  I’d have taken two pages to say exactly the same thing.  Unfortunately, the Sun isn’t very cooperative.  It keeps moving all the time.  It could only work if your destination was roughly west of you and you had a very fast aeroplane. Then for the Sun’s azimuth to remain constant, speed x cos(track-270°) would have to equal 15’longitude/minute of time.   E.g. flying west at 60°N you would need 15cos60° nm/minute= 7.5nm/min or 450kts groundspeed.  The Vulcan cruised west at M0.84 FL430 = 480kts TAS most days. Crossing the Atlantic E to W, we would occasionally find we had precalculated the same Hc and azimuth for two or three Sun lines in a row.    DaveP