Calculated times after the selected date, rounded to the minute. Clock changes are applied to each event. These times are not moonrise or moonset times.
The month at a glance
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
Percentages in the cells are rounded to the nearest whole number. A display of 100% does not mean the exact full Moon occurs at noon.
Understanding the results
The cycle angle is the difference in ecliptic longitude between the Moon and Sun: 0° corresponds to new Moon, 90° to first quarter, 180° to full Moon and 270° to last quarter.
The illuminated fraction is calculated separately from Sun–Moon–Earth geometry. It may therefore differ slightly from 50% at the instant of a quarter defined in longitude.
The labels “near” a principal phase refer here to an angular difference of no more than 1°. The table provides the calculated time of that phase.
Method, accuracy and sources
Local calculations with Astronomy Engine 2.1.19 by Don Cross, under the MIT licence. The engine is included in the site: no entered date is sent to a calculation service. This tool covers 1900–2100. Time zone rules come from the browser; future civil time rules may change.
Functions used: MoonPhase, Illumination, SearchMoonPhase, SearchMoonQuarter and NextMoonQuarter. Phases are geocentric; the diagram is a geometric representation of the illuminated fraction, not a photograph or a map oriented for your location.
Reference check: eight principal phase times in 2026 compared with US Naval Observatory tables, with a verification threshold of two minutes. This spot check does not guarantee uniform accuracy across the whole period. Small differences from other ephemerides are possible.
