From the Spring Equinox to the Summer Solstice the light grows longer and stronger as the Sun reaches toward it’s peak on his journey northward in the Northern Hemisphere on June 20. Of course it is a mirror image in reverse in the Southern Hemisphere where life there is experiencing the weakening of the Sun’s rays.
One of the beauties of understanding our universe astronomically and astrologically is the sense that perspective is based on location and because of this relativity rules; there is no absolute Truth. Is it summer or winter? Both are true. The Hindus call mind based reality Maya or illusion because of this relativity of perception.