NavList:

   

Reply

Just curious but when Harrison created his chronometers
there had to be some standard against which they were
set.  Of course land based clocks were around but even
those clocks had to be set against some other standard.
I would guess that the ultimate standard at that time
would have been astronomical. But still what exactly
was used to arrive at accuracy of a few seconds.
Was the land based authority setting GMT associated
with the Almanac office?
Assuming timing of a star one ends up with a sidereal
clock but when did land based clocks achieve sufficient
accuracy to time a star over 24 or more hours so as
to differentiate between sidereal and solar time?

Any book recommendations that cover this topic in detail?

   

Reply