How many letters does the top answer for “one celestial body obscures another” have?

The most common answer is eclipse (7 letters).

Crossword clue: one celestial body obscures another

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

eclipse 7 letters wn-def

one celestial body obscures another

occultation 11 letters wn-def

one celestial body obscures another