PAL

Ptolemaeus Arabus et Latinus

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% (the percent sign) is the placeholder for no, one or more than one character.
%% (two percent signs) is the placeholder for no, one or more than one character, but not for blank space (so that a search ends at word boundaries).

At the beginning and at the end, these placeholders are superfluous.

tabulated at intervals of 1/2° ‘tabulated at intervals of 1/2°’

English

References: Alm. Toomer: 56
Translation of:
Greek: καθ’ ἡμιμοίριον παρηυξημένας [Alm. Heiberg: I.10, 47:4-5]