Tropic cancer
The Length of Daylight in Kansas City on June 21st in 14 Hours
It depends on your location on Earth. At the south pole, there are 0 hours of daylight on June 21... until ~13,000 years from now when the Earth's axis of rotation will precess to give it summer in June.
24 hours
The length of daylight in Kansas City on June 21st is about 14 hours. June 21st is the first official day of summer.
On June 21, the summer solstice, all points along the equator experience approximately 12 hours of daylight and 12 hours of darkness due to the tilt of the Earth's axis. This is the only day of the year when the entire equator receives an equal amount of daylight.
Twelve hours of daylight on the Antarctic continent would be a phenomenon experienced in a narrow, circular band of geography between the Antarctic Circle and the South Pole. This phenomenon would occur midway between December 21 and June 21, and again between June 21 and December 21.
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Antarctica, where there would be zero hours of daylight. Anyplace south of the equator will have less than 12 hours of sunlight, and the farther south, the less daylight you will have in late June. June 21 is the Summer Solstice in the northern hemisphere, and the winter solstice in the southern hemisphere.
Longest day (midsummer): 17 hours on June 21Shortest day (midwinter): 7 hours on Dec 21
June 21 is the longest day of the year in the Northern Hemisphere because it marks the summer solstice, when the North Pole is tilted closest to the sun. This tilt causes the sun to stay out longer, resulting in more daylight hours.
June 21 is the summer solstice, also known as the first day of summer in the Northern Hemisphere. It is the day with the longest daylight hours of the year.
From December 21 to June 21, the days gradually lengthen, resulting in a gain of approximately 5 to 6 minutes of daylight per day. Over this period of about six months, this totals roughly 180 minutes or 3 hours of additional daylight by June 21. The exact increase may vary slightly depending on your geographic location.