descent of the heavenly grandchild
Refers to the mythological descent of Ninigi-no-Mikoto, grandson of Amaterasu, from heaven to earth in Japanese mythology. Often used in discussions of Shinto and the imperial lineage.
The descent of the heavenly grandchild is an important scene in Japanese mythology.
Compound of 天孫 (てんそん, 'heavenly grandchild') and 降臨 (こうりん, 'descent'). The term originates from Japanese mythology, specifically the Kojiki and Nihon Shoki.