June solstice on 21. June 2018. The longest day of the year with 15 hours sunlight.The June solstice is the summer solstice in the Northern Hemisphere and the winter solstice in the Southern Hemisphere. A solstice happens when the sun’s zenith is at its furthest point from the equator. On the June solstice, it reaches … The post June Solstice: The longest day of the year with 15 hours sunlight appeared first on Keep Talking Greece.