An alternate, more formal adjectival form meaning the same as heliocentric—placing the sun at the center of the solar system.
From the same Greek and Latin roots as heliocentric, with the addition of the '-al' suffix for emphasis or formality, common in older scientific writing.
This word is basically old-fashioned—modern scientists just say 'heliocentric,' but you'll find 'heliocentrical' in older astronomy texts like they're trying to sound extra official!
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