Today is the equilux.
This is the point when day and night are exactly equal. From today our days will be longer than the nights - a welcome relief after the winter.
It happens a few days before the spring equinox, and a few days after the autumn equinox.
It is all down to how the Sun's light reaches us - refracted from the Earth's atmosphere adding a few minutes of extra daylight.
Monday marks the spring equinox- the point the sun ends up exactly above the equator between the Northern and Southern Hemisphere.
The spring equinox marks the beginning of the astronomical spring.