(Greek mythology) The five Greek gods of the "Wandering Stars", (i.e. "planets"), (Phaenon (Saturn), Phaethon (Jupiter), Pyroeis (Mars), Eosphorus/Hesperus (Venus), and Stilbon (Mercury). They were the sons of the Eos (goddess of the dawn) and Astraeus (god of the dusk), and their siblings were the four Anemoi ("winds").

An international auxiliary language and worldlang created in 2010 that incorporates words from several languages.

That branch of astronomy that deals with the planets of the solar system.

A system of gears that has a central gear wheel (sun gear) around which others (planet gears) rotate, often within an outer ring.

A planetary nebula.

(astronomy) Of, or relating to planets, or the orbital motion of planets. / Of, or relating to the Earth; terrestrial. / Of, or relating to the whole Earth; global. / (of a gear train) epicyclic

(astronomy) a ring of dust, moonlets and other matter that orbits a planet (such as Saturn) as a flat disc; gaps in the ring are due to the presence of shepherd moons

A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling. / An orrery.

plural of planetarium

plural of planetarium