A Multichronometer is an important survey sensor, but one easily overlooked by those who have never left their home planets, This timepiece sets itself, in one planetary rotation, to local zero meridian time, local solar time, and local sidereal time. A setting allows for automatic time zone corrections according to world size. The mulitchronometer also keeps Imperial standard time.
The sidereal and zero meridian times are of interest mainly to the astronomer and navigator, giving them the spin place of the world, its year length and other information. Worn on the wrist, hence the name wristwatch.