Summer Solstice This is observed on 21, June. It is the longest day in India with the longest period of daylight. As well all know On June 21st, the Northern Hemisphere is tilted towards the sun. The rays of the sun fall directly on the Tropic of Cancer.As a consequence, those areas receive extra heat. The areas near the poles get less heat (as the rays of the sun are slanting). The North Pole is inclined towards the sun & the places beyond the Arctic Circle experience continuous daylight for almost 6 months. As a large portion of the Northern Hemisphere is receiving light from the sun, it is summer in the regions north of the equator. The longest day & the shortest night at these places occur on 21st June.And the condition will be reversed in the Southern Hemisphere.It is winter season there. The nights are longer than the days.