秋分

1. Origins, structure, and basic meaning

• Structure: 秋分 is read as しゅうぶん and means “autumnal equinox”.
• Basic usage: The examples show the autumnal equinox marked on a calendar and modeled through the sun’s position.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It is the autumn seasonal point when day and night are approximately equal and pairs with spring equinox 春分.