Summer Solstice 2025 Longest Day. Summer solstice 2025 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost. The summer solstice — is the moment when the sun, in its movement along the ecliptic, enters its northernmost point in the northern hemisphere, or the southernmost point in.

Find the answers to common questions, like: The longest day of the year falls on either june 20 or 21 every year in the northern hemisphere.