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    Home > Biochemistry News > Biotechnology News > Solar constant

    Solar constant

    • Last Update: 2020-11-23
    • Source: Internet
    • Author: User
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    day and night are due to the Earth's rotation, and the seasons are caused by the angle between the Earth's axis of rotation and the Earth's orbit around the sun at a angle of 23 degrees 27." The Earth rotates from west to east every day through its own "earth axis" of the South pole and the North Pole for a week. Every turn is a day and night, so the Earth turns 15 degrees per hour. In addition to its turn, the Earth orbits the sun for a week each year in an elliptical orbit with a small eccentricity. The normals of the Earth's axis of rotation and the surface of the orbit of the public have always been 23. 5 degrees. The direction of the axis of rotation does not change when the earth is turned, always pointing to the north pole of the earth. Thus, when the Earth is in different positions in orbit, the direction in which sunlight is projected on the Earth is different, thus forming four seasons of change on Earth. Every day at noon, the height of the sun is always the highest. In low tropical latitudes (i.e., between 23 and 27 degrees north and south of the equator), the sun has two vertical infractions during the year, and at higher latitudes the sun is always close to the equator. In the Arctic and Antarctic regions (greater than 90 to 23 degrees 27 degrees in the northern and southern hemispheres), the sun is longer than the horizon in winter and longer than the horizon in summer.
    because the Earth orbits the sun in an elliptical orbit, the distance between the sun and the Earth is not a constant, and the distance between the sun and the earth is different every day of the year. It is well known that the intensity of radiation at a certain point is inversely inversely related to the square distance from the source of the radiation, which means that the intensity of solar radiation above the Earth's atmosphere will vary depending on the distance between the sun and the earth. However, the intensity of solar radiation outside the Earth's atmosphere is almost constant due to the large distance between the sun and the earth (an average distance of 1.5 x 108km). So the so-called "solar constant" is used to describe the intensity of solar radiation above the Earth's atmosphere. It refers to the solar radiation energy received at the average solar-earth distance, perpendicular to the unit surface area of solar radiation in the upper bounds of the Earth's atmosphere. The standard value of the solar constant measured by various advanced means in recent years is 1353w/m2. The change in solar radiation intensity due to changes in the distance between the sun and the earth during the year does not exceed 3.4%.
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