皇霊祭
Meanings
1
imperial equinoctial ancestor ceremony
A specific Shinto ceremony performed by the emperor at the shrine of imperial ancestors during the spring and autumn equinoxes. Now largely historical; the modern public holidays 春分の日 and 秋分の日 replaced the public observance.
The Kōreisai was one of the imperial court rituals formerly held during the spring and autumn equinoctial weeks.