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www.reference.com/science/june-21-longest-day-year-7e80a07a21b326ce

June 21st is the longest day of the year in the Northern Hemisphere because it is the summer solstice, which describes the tilt of the Earth's axis. This phenomenon is only observable outside of the tropics as it is the tilt of the Earth that alters the duration of light exposure of any one point on the surface.

www.vox.com/science-and-health/2019/6/14/18679392/summer-solstice-2019-june-21

The summer solstice is upon us: Friday, June 21 is the longest day of 2019, and the start of the summer season, for anyone living north of the equator. Google is marking the day with a Google ...

en.wikipedia.org/wiki/June_21

June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian calendar.193 days remain until the end of the year. This day usually marks the summer solstice in the Northern Hemisphere and the winter solstice in the Southern Hemisphere, which is the day of the year with the most hours of daylight in the Northern Hemisphere and the fewest hours of daylight in the Southern Hemisphere.

www.timeanddate.com/calendar/june-solstice.html

June (summer) solstice is June 20, 21 or 22. Longest day of the year in the Northern Hemisphere shortest (winter solstice) in the Southern Hemisphere. Local times worldwide.

earthsky.org/earth/why-isnt-the-longest-day-of-the-year-the-hottest-day

Why hottest weather isn’t on longest day. ... June 21, 2019. June solstice 2019. It’s the longest day for us on northern Earth, but the hottest weather for the Northern Hemisphere is still to ...

www.answers.com/Q/Why_is_June_21_the_longest_day_in_the_year

The solstices are the longest and shortest days of the year; there are always two every year. In the Northern Hemisphere, the summer solstice (longest day) is usually June 20 or 21 and the winter ...

www.quora.com/Why-is-the-21st-of-June-the-largest-day-of-year

June 21st is the “longest” day of the year or what is known as the summer solstice. This is the longest period of daylight for the Northern Hemisphere. This is due to the tilt in the Earth’s axis that points towards the sun. At the point of summer...

time.com/5314789/summer-solstice-facts

The 2018 summer solstice, the longest day of the year, starts on June 21. Here's what you need to know, including what time it starts. Today Is the Longest Day of the Year. Here's What to Know ...

metro.co.uk/2017/06/14/when-is-the-longest-day-of-the-year-and-why-is-it...

Although June 21 is the longest day of the year, it is not the day of the earliest sunrise, in fact this week leading up to the solstice will have an early sunrise, by one minute than the day of ...

www.timeanddate.com/astronomy/facts-about-june-solstice.html

June 20, 2020 is the longest day of the year in most time zones in the Northern Hemisphere. Here are 11 things you might not know about the June solstice. ... Even though most people consider June 21 as the date of the June solstice, it can happen anytime between June 20 and June 22. ...