nadir

n. 天底、最低點

學術名詞

• 天底：天文學、物理學、測量學、航空太空、機械工程、土木工程
• 天底點：海事、地質學
• 對地方向：航太
• 天底[點]：氣象學

英文釋義

1. an extreme state of adversity; the lowest point of anything
2. the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected