Question

Когда на земном шаре продолжительность дня равна продолжительности ночи?

Answer 1

В день равноденствия - 20 марта и 23 сентября

Answer 2

Duration of Day and Night

The duration of day and night on Earth is not always equal. This phenomenon occurs twice a year, during the equinoxes. During the equinoxes, the duration of day and night is approximately equal all over the world.

Equinoxes: During the equinoxes, the tilt of the Earth's axis is perpendicular to the Sun's rays, causing the Sun to be positioned directly above the equator. This results in nearly equal lengths of day and night globally.

Conclusion

The duration of day and night is approximately equal during the equinoxes, which occur twice a year.