On Sun, 20 Apr 2008 12:51:53 -0700, "Capt. JG"
wrote:

Not sure what you mean about not being able to use it at night... What about
the artificial horizon common on modern sextants?

It might be possible but I doubt it. There used to be a sextant
designed for aircraft navigation in WW II that used an artificial
horizon of sorts but those guys were happy to know where they were
within 20 miles or so.

You can get latitude without accurate time by taking a series of noon
sites and plotting the maximum elevation. Longitude to any reasonable
degree of accuracy is very difficult without accurate time.