Summer Equinox 2025 Time. 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 point and will be located at the maximum distance north of the celestial equator. Thursday, june 20 is the official first day of northern astronomical summer for 2025 โ summer solstice โ which is the longest day of the year for this half of the planet.
Is it really the longest day of the year? Autumn / fall equinox 2025.