How to know the weather in my area?

1. Reason:

(1) The earth is a dull and opaque sphere.

(2) At the same time, the sun can only illuminate half the earth.

2. The dividing line between the day and the night hemisphere-the termination line.

(1) Solar Hemisphere: The height of the sun is greater than 0.

(2) Night Hemisphere: The height of the sun is less than 0.

(3) On the terminator line: the height of the sun is equal to 0.

3. Termination line and latitude and longitude.

(1) Judge the problem according to the intersection of the termination line and latitude.

① The terminator line passes through the north and south poles, and it can be judged that this day is around March 2 1 or September 23.

② The end line is tangent to the north and south poles, and it is daytime in the Arctic Circle. It can be judged that this day is around June 22, summer solstice in the northern hemisphere, summer in the northern hemisphere and winter in the southern hemisphere.

(3) The terminator line is tangent to the north and south poles, and it is night in the Arctic Circle. It can be judged that this day is around 65438+February 22, the northern hemisphere is winter solstice, the northern hemisphere is winter, and the southern hemisphere is summer.

Second, local time.

1. concept

Time varying with longitude is called local time.

Third, the deviation of the object moving horizontally along the surface.

1. Cause: geostrophic deflection force generated by the earth's rotation.

2. Law: Objects moving horizontally on the earth's surface tend to the right in the northern hemisphere, to the left in the southern hemisphere, and not to the equator.

The higher the latitude, the greater the deflection.

3. Impact on rivers

(1) In the northern hemisphere, the right bank scoured and the left bank silted.

(2) In the southern hemisphere, the left bank scoured and the right bank silted.

Geographical significance of the earth's revolution

First, the change of the height of the sun at noon

1. Variation with latitude

(1) Summer solstice: decreasing from the tropic of cancer to the north.

(2) East of the sun: decreasing from the tropic of Capricorn to the north and south sides.

(3) Vernal equinox: decreasing from the equator to the north.

With the change of seasons

(1) The Tropic of Cancer and its northern area: the height of the solar solstice is the highest in summer and the lowest in winter.

(2) Tropic of Capricorn and its south area: the sun height is the highest in winter and the lowest in summer.

(3) The area between the Tropic of Cancer: When the sun shines directly, the height of the sun is 90, and the sun shines directly twice a year.

Second, the change of the length of day and night.

1. Summer half year (vernal equinox to autumnal equinox)

The sun shines directly in the northern hemisphere, where the days are long and the nights are short. The higher the latitude, the longer the day and the shorter the night.

Summer solstice: The sun shines directly on the Tropic of Cancer, the longest day and the shortest night are observed at all latitudes in the northern hemisphere, and the Arctic Circle is extremely daytime.

2. Winter half year (autumnal equinox to vernal equinox of the following year)

The southern hemisphere has direct sunlight, while the northern hemisphere has short days and long nights. The higher the latitude, the shorter the day and the longer the night.

Winter solstice: The sun shines directly on the Tropic of Capricorn, with the shortest day and the longest night at all latitudes in the northern hemisphere, and the phenomenon of extreme night appears in the Arctic Circle.

3. Spring and Autumn Equinox

The sun shines directly on the equator, and the whole world is as long as day and night.

Division of three seasons and four seasons

1. Astronomical Four Seasons

Basis: Variation of the length of day and night and the height of the sun at noon.

(1) Summer: the season with the longest sunshine and the highest sun height in a year.

(2) Winter: the season with the shortest day and the lowest sun height in a year.

(3) Spring and Autumn: the transitional season between winter and summer.

2. Four seasons climate

Northern Hemisphere: Spring: March, April and May; Summer: June, July and August.

Autumn: September, 10, 1 65438+1October Winter: 12,1,February.

Division of four or five areas

1. Basis: the law of solar radiation decreasing from low latitude to high latitude.

2. Department:

(1) Tropical zone: between the Tropic of Cancer and the south.

(2) North-South temperate zone: between the Tropic of Cancer and the polar circle.

(3) North-South Cold Zone: between polar circle and pole.