During the summer time, we are tilted towards the Sun, so we get longer days as more light falls on this part of the planet.
As a result, the Sun spends a roughly equal amount of time above and below the horizon at every location on the Earth, so night and day are about the same length.
The word equinox is Latin for “equal night”.
Meteorologists use it as the official turning point in the seasons because – although it can vary from year to year, it allows for the most accurate record-keeping.
The theory goes, due to the sun’s equidistant position between the poles of the earth at the time of the equinox, special gravitational forces apply.
And many of the world’s ancient monuments were built as astrological calendars, to map the movement of the Sun over the course of the year.
The equinox is therefore a great time to visit these monuments, as they are often aligned to make the most of the Sun’s unique position in the sky.