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    Re: Th. Jefferson: stop wasting time on longitude
    From: Alexandre Eremenko
    Date: 2006 May 6, 19:40 -0500


    > Why was this expedition not equipped with
    > suitable telescopes?

    The telescope had to be quite large and heavy, including the
    tripod. I suppose it is also very fragile.

    > Since the U.S. did not have an
    > observatory of their own, Jefferson would have had to depend on
    > cooperation in Europe.

    Why an observatory in the US was needed?
    The eclipse times of the satellites were published by European

    >Maybe he felt that the moon
    >ephemeris in the N.A.
    > was sufficiently reliable to stand on its own, at least more so than
    > that of the Galilean satellites.

    Did not those Europeans that used the method successfully use the
    same Almanac?

    > But now that I read this letter, I see a second explanation.

    Sounds more plausible than the first one.
    But it could also be that the difficulty of
    transportation of a large telescope in such
    expedition was the reason.


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