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Земля совершает полный оборот вокруг своей оси за 23 часа 56 минут 4,1 секунды, день за это время сменяется ночью — проходят звёздные сутки. Под звёздными сутками понимают время полного оборота нашей планеты вокруг оси относительно звёзд, считая их бесконечно далёкими.

Чередование дня и ночи создаёт благоприятные условия для всего живого на Земле. Как известно, Земля имеет форму шара, и ось её вращения постоянно наклонена к плоскости орбиты под углом 66°33'22". Из-за этого солнечные лучи освещают разные участки земной поверхности неодинаково, поэтому и продолжительность дня и ночи везде разная. Она зависит от географической широты и времени года.