Egypt and the countries in the northern hemisphere are witnessing tomorrow, Saturday, the height of the summer, which occurs around this date every year, as the north pole tends toward the sun, and its rays are completely vertical over the course of the cancer at a latitude of 23.44 degrees north of the equator.
This is an astronomical day, which is the peak of the summer in this part of the world, and its day is the longest in the year, and its night is shorter. At its highest altitude above the horizon at noon.
After this date, the sun’s movement appears apparently in the sky towards the south, and this moment is scientifically called “summer solstice”, so the sun moves outward toward the south on a daily basis gradually until the autumn time of moderation comes, and then the sun rises again from the east completely and sets in the west completely again .
According to the astronomical calculations prepared by the experts of the National Institute for Astronomical and Geophysical Research, after the spring equinox that occurred this year on March 21, the apparent movement of the sun continued to move towards the north of the equator gradually and the sun's inclination continued to increase, so the hours of the day continued to increase gradually at the expense of Hours of the night, until the sun's rays are completely vertical over the course of the cancer, which is the moment of what is astronomer known as "the summer solstice June 21".
The summer is one of the four seasons of the year in which the planet Earth passes four important articulated points during its journey around the sun and takes about 365 days and 6 hours, which are spring equinox, summer solstice, autumnal equinox, and winter solstice. Its amount is 23.4 degrees, and it does not change while the Earth rotates around the sun. This causes the angle of sunlight to fall on the Earth, and it in turn has to change the four seasons.
And when summer begins in the northern hemisphere, the day increases in length as we move north of the cancer orbit line until its hours reach 24 hours at 66.5 degrees (North Pole) circle, meaning that the inhabitants of that region do not see the night throughout the summer period, and here are the nights that are not It is white nights, but in the equator, night and day are always equal regardless of the annual season, and this is why it is called the equator.