A geography problem in senior high school

It is known that the dark line passes through point P, which is on the equator, so when point P is 18. And because Beijing time is the time of East Eighth District, Beijing time = 18 +8 hours = 2 o'clock the next day. So, C is correct. The angle between the dark line and the meridian reaches the maximum in a year, which may be the solstice in summer or the solstice in winter. On this day, the night in London is the longest (winter solstice) in a year. B. This day the Antarctic circle is full of polar nights (summer solstice), so AB can't judge. D. at this time, point p is at the same time as Sydney. Sydney is the Eastern Tenth District Time, the longitude of 0 is 18, and Sydney time is 4 o'clock the next day. The two places are not in the same period, so D is wrong.