Laws Governing The Operation Of The Earth Around The Sun
Author: Source: Datetime: 2016-09-12 12:13:58
As we all know, portable solar power generator is used widely ,every day around the globe through its own Antarctic and Arctic
"axis" to one rotation from west to east. Per
revolution (360°) is a
day and night, day and night are divided into 24h, so the Earth rotates 15°per hour.
In addition to the Earth's rotation, but also to follow the sun around the small eccentricity of the elliptical orbit (the ecliptic), known as the "revolution", the period of one year. Orbital plane axis of rotation and revolution of running (the ecliptic plane) normal to the earth's tilt angle to 23°27 ', and when the revolution of the earth's rotation axis direction which is always the same, always pointing to the celestial North Pole. Therefore, solar power generation the position of the Earth in different orbits, the sun projected onto the direction of the planet is different, the formation of the Earth changes the seasons.
Suppose an observer located in the Earth's northern hemisphere mid-latitudes, we can sun annual apparent motion on the celestial sphere describes the situation as follows. Vernal Equinox Day each year (March 21), the sun reaches the equator from south of the equator (the sun's declination = billion accounted °), the Earth's northern hemisphere astronomical spring begins of solar power generator . Sunday, as the movement, but not in the sun for east due west, day and night of equal length. Midday sun height is equal to 90°Φ (Φ observer local geographical latitude).
After the equinox, the sun rose the daily placement toward the north, daylight hours grow shorter hours of darkness, the height of the sun to rise each day at noon. The summer solstice (June 22), the height of the midday sun reaches its maximum 90°- inflammation + 23°27 longest day, when the northern hemisphere astronomical summer. After the summer solstice, solar enery generator the sun by day to reduce the height of noon, while shortening the day, the sun tends to rise and fall due east and due west.
Autumnal Equinox Day (September 23), and from the sun to reach the equator north of the equator (the sun's declination 3 = 0 °), astronomy autumn the Earth northern hemisphere begins. Sunday apparent motion, the sun came out and not in the east due west, day and night of equal length. After the autumnal equinox, the sun rose the daily placement toward the south, shorter daylight hours and night time increases, the degree of the sun at noon Gao daily reduced. Winter solstice (December 22), the sun reaches midday Gao Min 90°-Φ 23°27 ', the longest night,solar power portable generator when the Earth's northern hemisphere astronomical start of winter. After the winter solstice, the sun of midday Gao Gao liters daily, while growth in the day, the sun tends to rise and fall due east and due west, until the spring of sub-Day (March 21) the sun reaches the equator from south of the equator.
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