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The angular separation in degrees of two objects is (physical separation × 360°) / (2 π...

The angular separation in degrees of two objects is (physical separation × 360°) / (2 π × distance). If an individual was observing our solar system from Castor at a distance of 11.2 light years. What angular resolution, in arcsecond, is needed to resolve the Sun-Earth system as distinct points of light?

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