Astrolabe

[Couch Potatoe]

An instrument for observing or showing the positions of
the stars. It is now disused.

[Lizzy Liz]

the presence of [leiby] [in space]; happens once every [13] years

[Vania]

a circular device used from ancient times until about the 18th century for measuring the position of stars, and on ships for calculating the ships position: