The ship’s navigator found the zenith distance of the center of the Sun at midnight to be 80 °. Where and at what time of the year

The ship’s navigator found the zenith distance of the center of the Sun at midnight to be 80 °. Where and at what time of the year could the ship be located and how many kilometers (approximately) the navigator would have mistakenly determined the position of the ship in latitude if he had not taken into account the influence of refraction.

Over the northern or southern polar circle in summer. Possible error could reach 8-9 km.

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