Almanac & sky · NUMORA
Composite Chart Calculator
Short-arc midpoints.
Open interactive calculatorHow to use
Midpoint method. Not Davison.
Formula
λ = short-arc midpoint(λA, λB)
FAQ
Is this Composite Chart 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?
Midpoint method. Not Davison.
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