Geographical solar lamp

Omitted, 65438+February 22nd, winter solstice, B=A=C, b > A & gtc； Faint line, 12: 00 20: 00? Bachelor degree from C>A>

(0 ,23 26? s)

This topic examines the comprehensive interpretation of the illumination map. (1) Characteristics of sunlight: perpendicular to the termination line; Earth rotation: from west to east; (2) The terminal line is tangent to the polar circle, with polar night in the Arctic circle and polar day in the Antarctic circle. Judged as winter solstice, the date is 65438+February 22nd; (3) the law of angular velocity of the earth's rotation: it is equal everywhere except the two poles; Law of linear velocity of rotation: decreasing from equator to north and south poles. (4) The picture is about to enter the night hemisphere from the day hemisphere along the rotation direction through OP, so it is judged as a dark line. (5) Point C is located on the meridian of direct sunlight, and the time is 12. When the longitude of meridian at point C is 0 and the time is 12, Beijing time can be calculated as 20: 00. (6) Illustrate the global distribution law of day length: the farther south, the longer the day; The farther north, the shorter the days. (7) The distribution law of midday sun height: decreasing from tropic of Capricorn to north and south sides. (8) From winter to the sun, the latitude of the direct point of the sun is 23.5 degrees south latitude; ; The meridian of the direct point of the sun, that is, local time 12, is 0.