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Knowledge › Eastern › Lunar calendar

When Does Lập Xuân Begin and What Customs Mark It?

Lập Xuân, the first solar term of the year, falls on 3 or 4 February (4 February in 2026). How it is calculated, why it changes the year, and its customs.

Updated 16 Oct 2026Calendar and astronomy
Knowledge › Eastern › Lunar calendar

When Does Lập Hạ Begin and What Customs Come With It?

Lập Hạ, the 7th solar term, opens summer when the Sun reaches 45 degrees of longitude, usually on 5 or 6 May. How it is calculated and its customs.

Updated 16 Oct 2026Calendar and astronomy
Dictionary › Choosing dates and hours

What is Tiết khí?

Solar terms are 24 markers dividing the year by the Sun's position on the ecliptic, used in East Asian calendrics to determine seasons and festivals.

Updated 12 Sept 2026Calendar and astronomy
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