The Longest Day Of The Year 2024 In India. The “summer solstice” occurring on june 21, marks the “longest day of the year” and signifies the onset of summer in the northern hemisphere. This astronomical event occurs when the earth's axial tilt is most inclined.

This is the first day of astronomical summer and occurs as the sun reaches its most. June 21st marks the summer solstice, a notable event when the northern hemisphere experiences the longest day of the year, while the southern hemisphere has the shortest.