Longest Day In June 2025. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having. June 21, 02:42 gmt (june 20, 10:42 p.m.
This is the day when the sun’s annual journey through the constellations of the zodiac carries it. A supermoon occurs when the moon’s orbit brings it closest to the earth at the same time as a full moon, according to nasa.