In the context of Celestial Navigation, what is the 'Assumed Position'?

The 'Assumed Position' in celestial navigation refers to the navigator's estimated position. This is a crucial point because celestial navigation involves determining a vessel's position at sea by observing celestial bodies, such as the sun, moon, and stars. Since navigating at sea doesn't provide immediate visibility into positioning, the navigator uses an assumed position to start calculations and then refines that estimate with celestial observations.

This estimated position serves as a reference point for taking sights and making calculations. From this point, navigators can compare the observed positions of celestial bodies to the assumed position to determine their actual location. By correcting their assumed position based on the sights taken from various celestial bodies, they can navigate more accurately.

In this context, the other choices do not align with the definition of 'Assumed Position.' The calculated center of the celestial sphere and the geographical center of the Earth are theoretical points rather than practical navigational references. The projected position of the celestial body does not pertain to the navigator's location or estimation but rather to where a celestial body is expected to appear in the sky.