On June 21st it's the longest day of the year, and June 21st marks the beginning of summer in the northern hemisphere. This means it will be very light - from early morning until late at night. To help stop light waking people up the Magic Blackout Blind is a temporary blackout window covering that is very simply to fit. Tear of the Magic Blackout Blind sheets and place on a window, they stop all light, even round the window edges. www.magicblackoutblind.co.uk
On June 21, there are 24 hours of daylight north of the Arctic Circle (66.5° north of the equator) and 24 hours of darkness south of the Antarctic Circle (66.5° south of the equator). The sun's rays are directly overhead along the Tropic of Cancer (the latitude line at 23.5° north, passing through Mexico, Saharan Africa, and India) on June 21.
Without the tilt of the earth's axis, we would have no seasons. The sun's rays would be directly overhead of the equator all year long. Only a slight change would occur as the earth makes its slightly elliptical orbit around the sun. The earth is furthest from the sun about July 3; this point is known as the aphelion and the earth is 94,555,000 miles away from the sun. The perihelion takes place about January 4 when the earth is a mere 91,445,000 miles from the sun.
When summer occurs in a hemisphere, it is due to that hemisphere receiving more direct rays of the sun than the opposite hemisphere where it is winter. In winter, the sun's energy hits the earth at oblique angles and is thus less concentrated.