Moonlight calculator
Estimated horizontal moonlight at 13 October 2026 at 21:00 BST: 0.0000 lux.
- Phase
- Waxing Crescent
- Illumination
- 10.25%
- Lunar age
- 3.173 days
- Phase angle
- 36.95°
- Earth–Moon distance
- 399,277 km
- Brown lunation
- 1284
- Apparent diameter
- 29.77 arcminutes
- Coordinates
- 51.5074°, -0.1278°
- Altitude
- -18.34°
- True-north bearing
- 252.94°
- Right ascension
- 15.552 hours
- Declination
- -25.20°
The estimate uses 0.267 lux for a full Moon at 384,400 km overhead before extinction, scales with inverse-square distance, lunar phase darkening and the sine of altitude, and dims by the chosen extinction. It describes horizontal illumination under clear air, without cloud or terrain.