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The March equinox is approaching, as the sun passes over the celestial equator in the event known as Starwatch.
Science

The March equinox is approaching, as the sun passes over the celestial equator in the event known as Starwatch.

This week, the sun will pass through the celestial equator, marking the arrival of the March equinox.

The celestial equator is the projection of the equator of Earth into the sky. Due to Earth’s tilted axis which remains constant in direction, our position in relation to the sun changes throughout the year. During the time when the hemisphere is facing the sun, the sun appears higher in the sky than the celestial equator and brings about summer with longer days. On the other hand, when the axis is angled away, the sun does not reach the same height as the celestial equator and results in winter with shorter days.

The summer solstice is the longest day and the winter solstice is the shortest. As the day length shifts from one to the other, there is a moment where the day lengths are approximately the same because the Sun is on the celestial equator. This occurs twice a year, in March and September. This year’s March equinox will occur on 20 March at 03:06 GMT. In some western time zones, the equinox will happen on 19 March local time.

Source: theguardian.com