Use this conversion or estimate to put astronomical distance or daylight quantities into a directly comparable unit before further analysis.

Date

Required string input.

Latitude (degrees)

Required number input.

Longitude (degrees)

Required number input.

UTC offset (hours)

Required number input.

Estimate local apparent sunrise, sunset, solar noon, and theoretical daylight from the NOAA solar equations. The sunshine duration is the astronomical maximum, not observed cloud-adjusted sunshine. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Daylight result

The resulting daylight result returned as an object.

• Astronomical quantities depend on reference frames, epochs, atmosphere, location, and approximation choices. This compact calculation does not replace ephemeris software or uncertainty propagation when observational precision matters.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

For observation planning, complement the result with a current ephemeris and the observer's exact coordinates and time scale. Keep full precision until the final displayed value.

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