The longest day of the year is the Summer Solstice, which normally happens on June 21 in the northern hemisphere and December 21 in the Southern Hemisphere. These dates can vary a day either way, depending on the cycle of leap years.
Check the link below to see a list of solstices and equinoxes from the US Naval Observatory's web site "Earth's Seasons".
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The longest day in Canada in 2008 was June 20th, which is the summer solstice. This is when the Northern Hemisphere experiences the longest period of daylight in the year.
The December day with the longest sunlight usually occurs around December 21st, which is known as the winter solstice. This is when the Northern Hemisphere is tilted farthest from the sun, resulting in the shortest day and longest night of the year.
The longest day of the year is called the summer solstice. It marks the official beginning of summer in the Northern Hemisphere.
Alaska has the longest day of the year with almost 24 hours of daylight during the summer solstice. Hawaii has the shortest day of the year with around 10 hours of daylight during the winter solstice.
Summer is not always the longest season. The length of each season is determined by the tilt of the Earth's axis and its position in orbit around the sun. In the Northern Hemisphere, summer is typically longer than winter due to the angle of the Earth's tilt.