Illumination angle and solar terms

(1) winter solstice? 12 22?

(2)C B？

(3) 12:00? 6:00? eight

(4) 23: 26 am (or Capricorn)

Test analysis:

(1) Extreme night phenome

(1) winter solstice? 12 22?

(2)C B？

(3) 12:00? 6:00? eight

(4) 23: 26 am (or Capricorn)

Test analysis:

(1) Extreme night phenomenon occurs in the Arctic Circle and its north. Judging that the direct point of the sun is located in the tropic of Capricorn, it shows that the solar term is the winter solstice in the northern hemisphere, and the date is about 65438+February 22.

(2) On that day, when the sun is directly shining on the Tropic of Capricorn, the closer it is to the direct point, the higher the sun height at noon, and the farthest point C is from the latitude of the direct point A, so the sun height at noon at point C is the smallest. The days are long and the nights are short in the southern hemisphere. The higher the latitude, the longer the day, so the day time at point B is the longest.

What is the lowest height of the sun at noon among the four points A, B, C and D on that day? The longest day is.

(3) Point A is the direct point of the sun, and the local time of the direct point is12: 00; Point D is located at the equator, and the equator is always equal to day and night, so the daytime time of point D is 12 hour and the sunrise time is 6: 00. The daylight saving time of point C is calculated according to the daylight saving time arc length of latitude where point C is located. The arc length of daylight saving time at the latitude of point C is 120, so daylight saving time is 8 hours.

(4) Judging the termination line according to the rotation direction of the earth. EF becomes daytime along the rotation direction of the earth, so EF is the morning line. On that day, the sun shone directly on the tropic of Capricorn, and the latitude of the tropic of Capricorn was 23 26'.

Comments: According to the different revolutionary positions of the earth, the vernal equinox and autumnal equinox are divided into two days, in which the sun shines directly on the equator, the tropic of cancer shines directly on the summer solstice, and the tropic of cancer shines directly on the winter solstice.