。
Was it a full moon or a new moon?
Literal
Full-moon was-[question-か] new-moon was-[question-か].
An 'either-or' question using two parallel か clauses — 満月でしたか、新月でしたか. The pattern A-ですか B-ですか offers two alternatives without an explicit 'or.' Japanese doesn't need a conjunction between the two; the twin か's carry the disjunctive sense.