I'm very certain that John just turns the City toward the Sun (or, if the City isn't located in our solar system, the central star of the solar system that the City is located in). There's no indication that John creates the star that we see and the only indication of movement we see is the City turning at a ninety degree angle relative to the star. Also, while a movie trailer probably isn't strictly speaking "canon," the ending of the trailer for the film implies that the underside of the City faces towards the sun (leaving the inhabited part of the City in shadow) because it shows us what looks like a total solar eclipse.
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