Astronomers Vs Harrison (clock maker) ref Longitude problem

In article ,
Hayley wrote:
well my original post provoked a friendly discussion I see!!

Apologies about that. I'd hoped to flag up some of the wider issues
withiout detracting from Old John's achievements (the clock collection
in the old observatory in Greenwich is a delight). To put it mildly,
the result was not what I'd aimed at.

I'd suggest an application of killfiles and a return to discussing
astronomy - and I'll go back to lurking for a while.

Ob. Lunations and Jovian eclipses: a check through my old copies
of the Admiralty manual of navigation reveals that these weren't
formally part of practice by the 1930s. I can onlt assume that
my father picked up the skills from an old-fashioned navigator
who regarded tham as still worth knowing - and who recognised
that clocks can break!

--
Andy Breen ~ Speaking for myself, not the University of Wales
"your suggestion rates at four monkeys for six weeks"
(Peter D. Rieden)