Almanac & sky · NUMORA
Planetary Hours Calculator
Twelve hours from sunrise.
Open interactive calculatorHow to use
Chaldean order. Sunrise from solar declination.
Formula
ruler = (weekday ruler + nth hour) mod 7
FAQ
Is this Planetary Hours 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?
Chaldean order. Sunrise from solar declination.
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