Summer Solstice 2025 Events Calendar. The year also features significant celestial phenomena for astronomy enthusiasts: This page contains a calendar of astronomical events (moon phases, eclipses, occultations, planetary conjunctions, seasons, etc.) for the year2025 (pacific standard time).

Summer solstice the summer solstice occurs on june 21, marking the longest day of the year in the northern hemisphere. Monday, sep 22 2:19 pm edt.