Palinurus n. : An instrument for obtaining directly, without calculation, the true bearing of the sun, and thence the variation of the compass

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Taxonomy
Palinurus, free encyclopedia, Aeneas, Somnus, genus, search, mythological figure, spiny lobsters, helmsman, Trojan, hero, descendants, city of Rome, price, safe passage, unum, pro multis, caput.

Defination from the web:
Palinurus (genus). Palinurus, in Roman mythology, is the helmsman of a ship of the Trojan hero Aeneas, whose descendants would one day found the city of Rome. ... Palinurus is mentioned in Utopia by Sir Thomas More as a type of careless traveller. ...