Star Wars: The Last Jedi: The Visual Dictionary establishes that the Ahch-To system is a binary star system, as Star Wars: Episode VIII The Last Jedi features the planet with twin suns. Despite this, "Forces of Nature: The Wild Spaces and Wilder Creatures of the Star Wars Galaxy" in Star Wars Insider 216 states that the appearance of twin suns over Ahch-To was a vision of the Tatoo system.
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