12+12: The Day of the Spring Equinox On March 20 at 17:46 MSK, astronomical spring will start in the Northern Hemisphere of the Earth. On this day, the line separating day and night on the planet will pass through the South and North Poles - along the meridians. As a result, the Sun will be above the horizon for precisely 12 hours and below it for 12 hours globally, leading to an equal duration of day and night worldwide. This balance gives the equinox its name, signifying a day when day and night are of equal length. However, due to refraction - the bending of sunlight in Earth's atmosphere - daylight will actually extend slightly beyond 12 hours.

On March 20 at 17:46 MSK, astronomical spring will start in the Northern Hemisphere of the Earth.

On this day, the line separating day and night on the planet will pass through the South and North Poles - along the meridians. As a result, the Sun will be above the horizon for precisely 12 hours and below it for 12 hours globally, leading to an equal duration of day and night worldwide. This balance gives the equinox its name, signifying a day when day and night are of equal length.

However, due to refraction - the bending of sunlight in Earth's atmosphere - daylight will actually extend slightly beyond 12 hours.