either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days 至(指冬至或夏至)
派生 solstitial adjective 语源
Middle English: from Old French, from Latin solstitium, from sol 'sun' + stit- 'stopped, stationary' (from the verb sistere)