In Buddhism the equinox is known as 'Higan' (彼岸).
Higan translates as 'Other Shore', a reference to the far shore of the 'Sanzu-no-kawa' (三途の川 'River of the 3 Crossings'). Similar to the River Styx in Greek Mythology, the dead would cross the river to reach the afterlife.
Week-long services called Higan-e (彼岸会) are held at temples. It's usual for people first to listen to sermons and then visit family graves.
Whereas 'Spring Higan' (春彼岸) typically shows gratitude for all living things, 'Autumn Higan' (秋彼岸) gives thanks to the dead.
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