The longest day of the year is June 21st, often known as a summer solstice. The Summer Solstice is the longest day of the year. It appears that you might be referring to the “summer solstice.” The summer solstice is an astronomical event in which one of Earth’s poles reaches its maximum tilt toward the Sun. This occurs twice a year, once in each hemisphere. The Northern Hemisphere often experiences it around June 21st, whereas the Southern Hemisphere experiences it around December 21st.
During the summer solstice, the Sun reaches its highest position in the sky at noon. Because of the Earth’s irregular orbit and axial tilt, the actual date and time may differ slightly from year to year.
The summer solstice is the longest day of the year, resulting in the most daylight. It signifies the start of summer and is celebrated in numerous civilizations through celebrations and ceremonies.