solsticen. 至、至日、至點、極限、決定性時刻學術名詞至點：測量學、氣象學、海事〔二〕至〔點〕：地球科學二至點：物理學夏至：氣象學冬至：氣象學英文釋義either of the two times of the year when the sun is at its greatest distance from the celestial equator