What is the maximum elongation of the Earth from the Sun when observed from the vicinity of Jupiter, whose orbital radius is 5.2 AU?

since the radius of Jupiter’s orbit is 5.2 AU, and the radius of the Earth’s orbit is 1 AU, the question posed in the problem can be reformulated as follows: at what maximum angle can you see a segment of 1 AU, one from the ends of which is located at a distance of 5.2 AU. from an observer? This angle is equal to arcsin (1 / 5.2) = 11.1 This is the maximum elongation of the Earth when viewed from Jupiter.