# It is known that Jupiter is located 5 times further from the Sun than the Earth. Once in St. Petersburg at midnight

It is known that Jupiter is located 5 times further from the Sun than the Earth. Once in St. Petersburg at midnight, a young astronomer, observing Jupiter in the southern part of the sky through a telescope, noticed a sudden change in its atmosphere. How much earlier did this change occur on Jupiter itself?

If Jupiter was observed in the south at midnight (when the Sun is in the north), then at that moment it was closest to the Earth.This means that at that moment the distance between Jupiter and the Earth was 5-1 = 4 times greater than the distance from the Earth to the sun. It is known that light travels from the Sun to the Earth for 500 s. Consequently, the young astronomer noticed a change in the atmosphere of Jupiter 4 • 500 = 2000 s (ie, just over half an hour) after it happened.

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