Almanac & sky · NUMORA
Solar Terms Calculator
Sun every 15° of ecliptic longitude, Beijing time.
Open interactive calculatorHow to use
Solar terms are the Sun, not the lunar month. Lichun is the Bazi year boundary.
Formula
λ = 315° + 15°k; bisection on Julian Day
FAQ
Is this Solar Terms calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Solar terms are the Sun, not the lunar month. Lichun is the Bazi year boundary.
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