Read the following weather forecast diagram and answer questions 1 to 2.

1. According to the information in the picture, the closest solar term on that day is (b)

a. Vernal Equinox (March 21) b. Guyu (April 20)

c． Beginning of Summer (May 5) d. Xiaoman (May 21)

Today’s day length is 18:56-05:29 = 13 hours and 27 minutes, and tomorrow’s day length is 18:57-05:28 = 13 hours and 29 minutes. The day length the day after tomorrow is 18:58-05:26 = 13 hours and 32 minutes, so the day length increases by 2 to 3 minutes every day (about 2.5 minutes on average); day and night are of equal length on the vernal equinox, and the day length is 12 hours. As of today The length of time increases by 1 hour and 27 minutes. If the day length increases by 2.5 minutes per day, 1 hour and 27 minutes ÷ 2.5 minutes/day will wait approximately 35 days. March 21 + 35 days = April 25, so that day is the closest solar term. It’s Guyu (April 20).

Answer: b. Guyu (April 20)