Wed, Jun 28, 2017 - Page 14 News List

Expert explains why summer solstice not hottest day
夏至為何不是最熱 專家這樣說

Two women shade themselves from the fierce sun in Kaohsiung on June 12.

Photo: Huang Chih-yuan, Liberty Times

June 22 was the summer solstice this year, but according to meteorological expert Wu Teh-jung, Taiwan’s annual summer solstice has not historically been the hottest day of the year. Despite this, due to the North Pacific High anticyclones, the weather was sunny and settled throughout the country, with daytime temperatures of between 34 and 36 degrees Celsius in the west.

According to Wu, Central Weather Bureau records show that Taiwan’s hottest day of the year has not historically fallen on the summer solstice, neither has it been the “xiao shu” (lesser heat) or “da shu” (greater heat) days, but has been around the “li qiu” (start of autumn). The sun’s rays produce energy on the Earth, and when you subtract the amount of energy dispersed away from the planet, if you are left with a “positive” value then the Earth will heat up; if left with a “negative” value the planet will cool. At the time of the summer solstice the sun is shining on the Tropic of Cancer, and the amount of energy absorbed by the Earth is greater than the amount lost. As a result, temperatures start to rise.

When there are successive days of sunshine, ultraviolet rays can be very strong and you should keep out of the sun, drink lots of water, and avoid getting sunstroke.

(CNA, translated by Paul Cooper)






1. summer solstice phr.


(xia4 zhi4)

2. sunny adj.


(qing2 lang3)

3. ultraviolet ray phr.


(zi3 wai4 xian4)

4. sunstroke; heat stroke n.; phr.


(zhong4 shu3)

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