On _____ date Summer Solstice, the longest day of the year 2019 is observed ?

1) June 21
2) June 20
3) June 19
4) June 18

Explanation:
On June 21, 2019, Summer Solstice day was observed. It is also known as the ‘June Solstice’. Summer Solstice is the longest day of the year which is considered as the start of the summer season. This day marks the official start of the summer season in Northern hemisphere.The solstice marks the moment the planet’s axis is either titled towards the Sun or away from the Sun.In June, on the Summer Solstice, the Northern Hemisphere tilts towards the Sun while the Sun faces away.