[Paddlewise] Longitude and astronomy

Craig wrote............
True. But Chuck specifically said that they could determine true east and
west from the stars. My gut reaction to this was "BS" but upon thinking it
over I believe that knowing the BAND of stars that ring the equator could
give them clues to true east and true west (independently of the sun). Of
course, keeping Polaris to your starboard or port would also work; as long
as you were far enough above the equator to see Polaris............

G'day Craig,

The book "Longitude" centres around a dispute between the Astronomer Royal
and the clockmaker Harrison, about the relative merits of clocks vs. a very
protracted and complicated calculation based on star measurements that was
in vogue at the time. Its an engrossing read, as good as any political
thriller and not at all dry. Recommend the illustrated version to anyone who
hasn't read it. Or the BBC TV series.

I've often wondered just how the astronomers did their calculation and it
sounds as if you have insight into how this might have worked. I'd be glad
of any suggestions you might have for understanding  the method better?

All the best, PeterO
***************************************************************************
PaddleWise Paddling Mailing List - Any opinions or suggestions expressed
here are solely those of the writer(s). You must assume the entire
responsibility for reliance upon them. All postings copyright the author.
Submissions:     PaddleWise_at_PaddleWise.net
Subscriptions:   PaddleWise-request_at_PaddleWise.net
Website:         http://www.paddlewise.net/
***************************************************************************