Detection and Variability of Closure Phases in Sgr A*

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Closure phases measured on the Arizona-California-Hawaii triangle of the EHT over multiple years indicate that the 1.3 mm structure of Sgr A* is asymmetric on scales of a few Schwarzschild radii. The closure phase data provide new constraints on models of the quiescent emission from Sgr A*. Time variability in the closure provides evidence of structural changes on scales resolved by millimeter-wavelength VLBI.
We discuss these results as well as other implications of the data.