Almanac & sky · NUMORA
Solar Return Calculator
When the Sun returns to the natal longitude.
Open interactive calculatorHow to use
Root-find the Sun’s longitude.
Formula
λ☉(t) = natal λ☉
FAQ
Is this Solar Return 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?
Root-find the Sun’s longitude.
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