Almanac & sky · NUMORA
Eclipse Approx Calculator
Syzygy near the node. A coarse eclipse filter.
Open interactive calculatorHow to use
Not a NASA mid-eclipse clock.
Formula
syzygy and |λ☾−Ω| < 18°
FAQ
Is this Eclipse Approx 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?
Not a NASA mid-eclipse clock.
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