PAL

Ptolemaeus Arabus et Latinus

_ (the underscore) is the placeholder for exactly one character.
% (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.

ساعة من الساعات الاعتدال ‘equinoctial hour’

Arabic

References: Alm. MS Leiden: f. 14v
Translation of:
Greek: ἰσημερινὴ ὥρα [Alm. Heiberg: II.1, 88:16; II.2, 90:1]
Synonyms:
ساعة معتدلة[Alm. MS Leiden: f. 14v]
ساعة معتدلة[Plan. Hyp.: II.18]
ساعة من الساعات الاستوائية[Alm. MS Tunis: 19b.3; 19b.17-18]