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Tenmon (天門, Tenmon) is the ninja art of understanding and using meteorology as a strategic weapon.[1] It allowed ninja to foresee weather changes and to use them as an advantage. By knowing nature's changes, animal behaviour, or atmospheric signs, one could use rainy weather or a hot sunny period as strategic elements to weaken and defeat the enemy.


  1. ^ Hisamune, Hatsumi. "Tenmon Chimon" (PDF). Retrieved April 7, 2017.