How many letters does the top answer for “having the sun as the center” have?

The most common answer is heliocentric (12 letters).

Crossword clue: having the sun as the center

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

heliocentric 12 letters wn-def

having the sun as the center

having a common center 50% similar → concentric, homocentric

having the earth as the center 50% similar → geocentric

having the same center. 50% similar → homocentric