NavList:

Frank,

Bob's problem as stated was measuring a time of Lunar occultation and assuming a Latitude determine observers Longitude.  As you pointed out observing occultations by Jupiter allows observor to determine time independent of position, so one can not determine their position directly from such an observation.  But of course knowing time, a usual sight and an assumed latitude easily give longitude.

It is the parallax that makes an observation of the time of occultation, when compared to the time of occultation at the GP of the moon as observed by someone at the GP, depend on the observers position.  I guess that dependence is a very insensitve determination of position as a short time converts to positions all over the surface of the earth.

Further, the problem as given is not determined.  We must also know where on the rim of the moon the occultation occurs relative to the direction of travel of the moon.

In any event any solution will be iterative.

Dave