Cilix is a small crater on Europa that serves as the reference point for the moon's system of

longitude Longitude (, ) is a geographic coordinate that specifies the east– west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek let ...

. The longitude of Cilix's center is defined as being 182° W, thus establishing the moon's

prime meridian A prime meridian is an arbitrary meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great ...

. It is named after

Cilix Cilix (; Ancient Greek: Κίλιξ ''Kílix'') was, according to Greek mythology, a Phoenician prince as the son of King Agenor and Telephassa or Argiope. Etymology In her book ''Who's Who in Classical Mythology'', author Adrian Room writes an ...

, the brother of Europa Cilix is about 15 km in diameter.

References

External links

Cilix Crater Flyover
{{crater-stub Impact craters on Jupiter's moons Surface features of Europa (moon)