Actually, it has been the longest day since this time last year — at least for those of us in the Northern Hemisphere.
June 20-21 is start of summer in the Northern Hemisphere but simultaneously the start of winter in the Southern Hemisphere. It’s also the longest day of sunlight for places in the Northern Hemisphere and the shortest day for cities south of the equator.
Oddly enough, it’s not necessarily the day when the sun rises the earliest or sets the latest. Depending on the latitude, it can rise earlier or set later several days either side of June 21.
Complicated, I know. Read the article to get the whole story.