Almanac & sky · NUMORA
New Full Moon Calculator
Syzygies: new and full moon.
Open interactive calculatorHow to use
Root-find elongation 0° / 180°.
Formula
λ☾ − λ☉ ∈ {0°, 180°}
FAQ
Is this New Full Moon 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 elongation 0° / 180°.
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