Average temperatures continue to climb until the sun drops lower in the sky. This lag is due to the time required for ground and water to heat up. Just as the warmest part of the day usually occurs several hours following noon, when the sun is highest in the sky, so too does the warmest part of the summer lags the summer solstice. In northern OH/Northwest PA, the maximum daily temperature occurs nearly 3 weeks later in mid-July. There is a lag between the longest day of the year and the warmest average temperatures for most mid and high-latitude locations. The Relationship Between Length of Day and Temperature The tilt's orientation with respect to space does not change during the year thus, the Northern Hemisphere is tilted toward the sun in June and away from the sun in December, as illustrated in the graphic below. Seasons are caused by the fact that the Earth is tilted on its axis by 23.5°. This fact may sound counter to what we know about seasons in the Northern Hemisphere, but actually, the difference is not significant in terms of climate and is NOT the reason why we have seasons. The aphelion, or the point at which the Earth is about 1.6 million miles farther away from the sun, occurs during the first week of July. During the first week in January, the Earth is about 1.6 million miles closer to the sun. This means that the distance between the Earth and Sun, which is 93 million miles on average, varies throughout the year. We all know that the Earth makes a complete revolution around the sun once every 365 days, following an orbit that is elliptical in shape. Naval Observatory. An alternative text link is found here. In the Northern Hemisphere, it occurs when the sun is directly over the Tropic of Capricorn, which is located at 23.5° south of the equator and runs through Australia, Chile, southern Brazil, and northern South Africa.įor a complete listing of the dates of the winter and summer solstices and spring and fall equinoxes through 2025, check out this site from the U.S. The winter solstice marks the shortest day and longest night of the year. For every place north of the Tropic of Cancer, the sun is at its highest point in the sky and this is the longest day of the year. The summer solstice occurs when the sun is directly over the Tropic of Cancer, which is located at 23.5° latitude North and runs through Mexico, the Bahamas, Egypt, Saudi Arabia, India, and southern China. Therefore, on the day of the summer solstice, the sun appears at its highest elevation with a noontime position that changes very little for several days before and after the summer solstice. The summer solstice occurs at the moment the earth's tilt toward/from the sun is at a maximum. Therefore, on the equinox and for several days before and after the equinox, the length of day will range from about 12 hours and six and one-half minutes at the equator, to 12 hours and 8 minutes at 30 degrees latitude, to 12 hours and 16 minutes at 60 degrees latitude. Additionally, the days become a little longer at the higher latitudes (those at a distance from the equator) because it takes the sun longer to rise and set. The "nearly" equal hours of day and night are due to refraction of sunlight or a bending of the light's rays that causes the sun to appear above the horizon when the actual position of the sun is below the horizon. At the equator, the sun is directly overhead at noon on these two equinoxes. The word equinox is derived from two Latin words - aequus (equal) and nox (night). These events are referred to as Equinoxes. There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a "nearly" equal amount of daylight and darkness at all latitudes.
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