Dr. Ashraf Tadros, professor of astronomy at the National Research Institute of Astronomy, said that we are expected to witness the "summer solstice" on Saturday, June 21. This is when the northern hemisphere tilts toward the sun by 23.5 degrees, which is the maximum tilt, as the Earth reaches its maximum distance from the sun in the first half of its orbit.

This day is considered the peak of summer astronomically in the northern hemisphere, as daylight reaches its peak, making it the longest day of the year (about 14 hours).