Tropic of Cancer at the altitude angle of the sun at noon in winter

On the summer solstice in the Northern Hemisphere, the sun shines directly on the Tropic of Capricorn, where the height of the midday sun is at its highest, about; On the winter solstice, the sun shines directly on the Tropic of Capricorn, and the height of the midday sun here is the smallest, about.

Because of the rotation of the earth, the direct point of the sun on the earth reciprocates between the Tropic of Cancer once a year. Take the area through the Tropic of Cancer in the Northern Hemisphere as an example: when the sunlight directly hits the Tropic of Cancer in a year, it is the summer solstice solar term in northern China, and the sun is directly above the head at noon, that is, the solar altitude angle is 90°, which is the maximum value of the year; When the sunlight hits the Tropic of Capricorn directly, it is the winter solstice solar term in the north of China, and the solar altitude angle at this time is the minimum value of the year.

In short, it is the change in the altitude angle of the sun and the division of the four seasons due to the revolution of the earth!

Yellow red angle.

The direct point of the sun moves between the Tropic of Cancer in a one-year cycle. On the summer solstice, the sun shines directly on the Tropic of Cancer (northern latitude), with the noon solar height north of the Tropic of Cancer reaching its maximum and the noon solar height south of the Tropic of Cancer reaching its minimum. On the winter solstice, the sun shines directly on the Tropic of Capricorn (southern latitude), and the situation is opposite to that of the summer solstice.

The rest of the time is a transition between these two states.

The existence of the yellow and red horns! Because the solar altitude angle is the greatest at noon every day. The yellow-red angle makes the direct sun point move south, changing with the change of the season, and what is said upstairs is referring to the difference in the direct sun point, the noon sun height of the direct sun point is the largest, but after all, there is only one place!

High midday is the time of day when the sun is at its highest.

This highest altitude varies with the seasons. It is lowest at the winter solstice, when the midday sun shines through the windows facing south into most of the rooms, and only a little on the windowsill during the summer solstice.

This maximum height also depends on the latitude you are in. If you are on the Tropic of Capricorn, north latitude, the sun is overhead at noon on the summer solstice, and its altitude is 90 degrees; Further north, as latitude increases, the height of the Sun decreases at noon.

1。On the Tropic of Capricorn, the winter solstice day (that is, December 22) at noon sun elevation angle:

90-(degree.)

2。Ocricorn solar elevation angle at noon in winter on the Tropic of Cancer (Note: In the northern hemisphere winter, the sun shines directly on the southern hemisphere; But which latitude of the Southern Hemisphere exactly, uncertain):

90°- (23 degrees 26 minutes + latitude of the point where the sun shines directly).

P.S. Calculation of the height of the sun at noon:

The formula is: noon sun height = 90° latitude difference, (the latitude difference in the formula refers to the number of degrees of latitude between the desired location and the direct point).

According to this formula, you can calculate the noon solar elevation angle at any latitude where the sun shines directly on the earth.

Tropic of Cancer at noon solar altitude in winter = = 90°- (23 degrees 26 minutes + latitude of the point where the sun shines directly).

Biased to the equator, specific data forgot.

When we walk outdoors, if the weather is fine and you can see your own shadow, if you observe carefully, the situation in different seasons is not the same, because it is related to the height of the sun, with its changes, it will show a different length, how to judge the old tassel yard, the following is illustrated by an example, and some calculation methods are recommended.

The height of the sun at noon on the Tropic of Cancer on the summer solstice

During this solar term, the solar altitude angle on the Tropic of Cancer is 90 degrees, which is the maximum value of the year. Because of the revolution of the earth, the direct point of the rising sun on the earth is repeated between the Tropic of Cancer and the Tropic of Cancer once a year. On the summer solstice, the midday sun is directly above the head, so the altitude angle is 90°.

When the direct sunlight reaches the Tropic of Capricorn, it is the winter solstice solar term in the Northern Hemisphere, and the solar altitude angle at this time is the minimum value of the year.

What is the calculation

Calculation formula: h=90?-|Local latitude Direct point latitude|

h represents the local noon sun altitude.

Local latitude refers to the latitude of a place requested.

The latitude of the direct point refers to the latitude where the direct point is located at this time.

Love to know remarks: If the local latitude and the direct point latitude die wheel degree are in the same hemisphere, use the minus sign, if in different hemispheres use the plus sign, and then take the absolute value.

Calculation skills: There are three variables in the formula: h, local latitude, and direct point latitude, know two of the three, and find the third variable.

Among the three variables, h is generally indirectly told or directly known through the height of the object and the length of the shadow of the object, and the latitude of the earth is known through the latitude and longitude map.

The latitude of the point of direct exposure is indirectly known by the date, the polar day and night range, or the angle between the morning and dusk lines and the meridians.

What is the solar term proverb

1.Mango seeds are sown in all things, and yellow plums are made on the summer solstice; The small summer is busy, and the big summer is a futian.

2.It is not cold until the winter solstice, and it is not hot until the summer solstice.

3.After the summer solstice festival, the husband and wife rested separately.

4.After eating summer solstice noodles, a long line is a day.

5.The days are long until the summer solstice, and the days are short until the winter solstice.

6.Eat a lily on the summer solstice, and there is no harm in the whole year.

7.The summer solstice is sunny, and there is no rain until the autumn side.

8.The summer solstice is a water festival, and if there is no rain, it is a dry day.

Tropic of Cancer at noon solar height on the winter solstice: according to the formula noon solar height = 90°.

On the day of the winter solstice, the sun shines directly on the Tropic of Capricorn, the day is the shortest in the northern hemisphere, the night is the longest, and the number of nine cold days starts from the winter solstice, and the sunrise to the day in most parts of southern China is not about 10 hours. After the winter solstice, as the Earth orbits around the Sun, the zone of direct sunlight gradually moves northward, causing the Northern Hemisphere to gradually increase the number of days and shorten the nights.

Although the winter solstice day has the lowest solar altitude and the shortest sunshine time, the ground absorbs more heat than the heat lost. Around the time of "Sanjiu", the heat stored in the land is the least, and the weather is the coldest.

The solar altitude at noon on the Tropic of Cancer on the winter solstice is 23°26 s.

On the winter solstice, the sun shines directly on the Tropic of Cancer (23°26 south latitude) and the angle between the Tropic of Cancer (23°26 north latitude) is 46°52. At this time, the solar elevation angle at noon on the Tropic of Cancer is the co-angle of this angle. So there is a cavity 90°-46°52 = 43°08

On the winter solstice, the direct point of the sun is on the Tropic of Capricorn, that is, 23°26 s.

For example, when the sun shines directly at 20 degrees north latitude and 20 degrees south latitude, the solar altitude of the noon rock at 40 degrees north latitude is 90-(40-20) and 90-(40+20) respectively.

The noon solar altitude angle decreases from north to south from the latitude of the direct point of the sun (in this case, 90°), and the decrease is equal to the difference between the local geographic latitude and the latitude of the direct point.

According to the annual change of the direct point of the sun, on March 21, the direct point of the sun was directly on the equator, and then in the following days, the direct point of the sun moved northward, and on June 22, the direct point of the sun fell on the Tropic of Capricorn, that is, 23 degrees 26 minutes north latitude, and then the direct point moved southward, and returned to the equator on September 23, after that, until December 22, the direct point of the sun still moved southward, and on December 22, it was directly on the Tropic of Capricorn.

From December 22 to March 21 of the following year, the point of direct fire continued to move northward and then shot directly at the Red Collapse Road again. On the 24th of the solar term, March 21 is the spring equinox, June 22 is the summer solstice, September 23 is the autumn equinox, December 22 is the winter solstice, due to the influence of the lunar calendar, the date is uncertain, but to know what day the sun shines directly on the Tropic of Cancer, we generally choose June 22, on this day on the Tropic of Cancer, people on the Tropic of Cancer can observe that at 12 o'clock at noon their shadow and their body are almost completely correct, as if there is no shadow, reaching the maximum value of the year.

The noon solar altitude angle 90°- The latitude distance between the local latitude and the direct point of the sun, so when the sun is directly shining on the Tropic of Capricorn, the noon solar altitude angle on the Tropic of Cancer is h 90°- 23°26' +23°26' |The two places use "+" when they are in the hemisphere).

h＝90°- 46°52'

h＝43°08

d. The equator and the region north of it.

The solar altitude angle is the most important factor that determines the amount of solar heat energy obtained on the earth's surface. When the solar altitude angle is 90°, the radiation intensity per mu of the sun is the largest. When the sun hits the ground obliquely, the intensity of solar radiation is small.

Sunrise and sunset, the angle of sun elevation in the same place is constantly changing throughout the day. The hour angle is calculated from 12 noon to 0 degrees, and every hour is 15 degrees. That is, 14 o'clock and 10 o'clock are 30 degrees and -30 degrees respectively.

The angle of sunrise and sunset is 0,1, and the solar altitude angle at noon can reach the minimum value of the whole year (the winter solstice day of the hemisphere) at the same time, but cannot reach the maximum value of the whole year at the same time;

2. In the area between the Tropic of Cancer, the sun reaches its annual maximum when the sun shines directly, not on the summer solstice of the hemisphere;

3. The annual maximum value (summer solstice day of the hemisphere) and minimum value (the winter solstice day of the hemisphere) on the Tropic of Cancer (the winter solstice day of the hemisphere); The area between the Tropic of Cancer has a maximum twice a year (when the sun is direct) and a minimum (the winter solstice in that hemisphere), but twice a year at the equator;

4. For areas outside the Tropic of Capricorn, the maximum value (summer solstice day of the hemisphere) and the minimum value (the winter solstice day of the hemisphere) are held once a year.

According to the formula for calculating the solar altitude angle of the noon town, the noon solar altitude of the ground is found = 90°-latitude difference.

The difference between the latitude and hail is the difference between the latitude of the ground and the latitude of the direct sun point, so when the direct sun point is located on the Tropic of Capricorn, the noon height of the Tropic of Cancer is 90°-(23°26 +23°26)=90°-46°52 =43°08, 5,43°08, 2,43 degrees and 08 minutes, 0,

Noon sun altitude = 90°-|Local geographic latitude - latitude of the point where the sun shines directly |=90°-|23°26′-（23°26′）|=43°08 December or 23 of each year. The direct point of the sun is on the Tropic of Capricorn, and the southern hemisphere has the longest days and shortest nights. At higher latitudes in the Southern Hemisphere, the longer the days and the shorter the nights, the polar day phenomenon occurs in the Antarctic Circle.

In the Arctic Circle, the phenomenon of polar night occurs. The farther the Earth is from the Tropic of Capricorn, the more inclined the sun's rays are, and the less solar heat is obtained. In contrast, the Southern Hemisphere receives more heat than the Northern Hemisphere at this time.

Since the sun still radiates less energy to the ground than the ground radiates into the air, the temperature continues to decrease for a short period of time. Generally, the northern hemisphere 12,1,2 months are winter, and the southern hemisphere is summer. Direct sun spot:.

Tropic of Cancer at noon sun height on the winter solstice: according to the formula.

Noon sun altitude = 90°-|Local geographic latitude - the latitude of the point where the sun shines directly at this time|=90°-|23°26′-（23°26′）|=43°08 The direct point of the sun on the winter solstice is on the Tropic of Capricorn, i.e. 23°26 s.

On the winter solstice, the sun shines directly on the Tropic of Cancer (23°26 south latitude) and the angle between the Tropic of Cancer (23°26 north latitude) is 46°52. At this time, the solar elevation angle at noon on the Tropic of Cancer is the co-angle of this angle. So there is 90°-46°52 = 43°08

On the winter solstice, the Northern Hemisphere has the shortest days and the longest nights.