Summer Solstice 2024 Longest Day 2024. On that day, the sun reaches its northernmost point in the sky, resulting in the longest day of the year for the northern hemisphere and the shortest day for the southern. The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins.
What exactly is the summer solstice? The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins.