Saturday 21st Jun 201409:49
21 June will mark midsummer in the northern hemisphere, and midwinter in the southern hemisphere.
On this day, the Sun will reach its most northerly point in the sky, as it tracks along its annual path through the constellations – the line of the ecliptic of zodiac.
As a result, the northern hemisphere will experience its longest day and its shortest night. Conversely, the southern hemisphere will experience its shortest day and its longest night.
According to the astronomical definitions of the seasons, this moment marks the beginning of summer in the northern hemisphere and of winter in the southern hemisphere.
At the June solstice, the Sun appears overhead at noon when observed from locations on the tropic of Cancer, at a latitude 23.5°N.