Almanac & sky · NUMORA

Solar Arc Calculator

Add progressed Sun’s travel to every point.

Open interactive calculator

How to use

Directions, not secondary progressions.

Formula

λ' = λ + (λ☉' − λ☉)

FAQ

Is this Solar Arc 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?

Directions, not secondary progressions.

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