Hello,
Here is an interesting page on the development of the lunar and later
jovian moons method for determining longitude by the ubiquitous
Flamsteed (17th century). I believe Lewis and Clark used the moons of
Jupiter to determine their longitude throughout their "survey".
http://www.ucl.ac.uk/sts/kollrstm/flammdl.htm
-Luke
Arthur Carlson wrote:
>
> could take years. The alternative of using the position of the moon relative
> to the stars would have been just too complicated for the knowledge of the
> time. Of course, chronometers and telescopes (to observe Jovian eclipses)
> did not exist.
