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> Yes.  A principle means of establishing latitude on land, where a plumb
> bob or spirit level can be used to establish one's "horizon."  At sea,
> with only a short time at twilight when both the real horizon and stars
> are visible, tough to find a star undergoing meridian passage (and
> wasting time better spent obtaining a 3-point or 4-point fix).

> I believe by timing the actual moment of meridian passage,
> longitude also can be determined, but I'm getting far out of my depth
> here.

Fred

I think you are in your depth and spot on.  I recall toying with the idea,
and looking for bright stars that would be making their meridian passage
during prime viewing time to discover--as you pointed out--the opportunities
are few and far between.

Bill

   

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