秋季皇霊祭
Meanings
1
autumnal imperial ancestor worship ceremony
A former imperial ceremony of ancestor worship held on the autumnal equinox (秋分の日). Now obsolete; the term is encountered only in historical contexts.
See also: 秋分の日
The Shūki Kōreisai was one of the imperial court rituals formerly held on the autumnal equinox.