At 21.21 tonight, the sun and the earth are exactly opposite each other.
But the day is still slightly longer than the night.
- They are almost as long, you actually have a little more sunlight than at night.
In a day, they will be exactly the same length, says SVT's meteorologist Tora Tomasdottir.
The onset of darkness also affects the weather.
- Now there will be much more clouds, the sun is not so high that it can dry out the clouds, says Tora Tomasdottir.
Hear more about how the weather is affected in the clip.