Lunar horizon timing
Approximate lunar timingMoonrise / Moonset
Estimate local moonrise and moonset from a date, coordinates and time zone using a simplified lunar-position model.
Approximation notice: rise/set is estimated from a simplified lunar-orbit model and a geometric horizon crossing. Refraction, topography and high-precision lunar parallax are not fully modeled; reference certification uses a 20-minute comparison tolerance, so this is not precision observational ephemeris data.
Accuracy boundary
Moonrise/set is sensitive to lunar parallax, refraction and the local horizon. Hourberry keeps this simplified calculation explicitly approximate; reference certification uses a 20-minute comparison tolerance, and local topography can still shift the observed event.