With reference to knowledge of astrology or astronomy, as starcraft, star lore, etc.; star-read, star-skilled, etc., adjs.

a new recruit; a person inexperienced in a particular occupation, activity, etc.; (often) spec. (U.S. Prison slang) a new inmate in a prison or…

slang in later use. spec. British. A prisoner serving his or her first sentence, (formerly) distinguished by a badge bearing a star. Cf. compounds 4b.

A newcomer, a novice (in certain spec. contexts: see quots.).