partial lunar eclipse

Partial lunar eclipse of 28 October 2023

The Moon passes through Earth's shadow at 20:13 UTC. Part of the Moon enters the dark umbral shadow, giving a clearly visible bite out of the lunar disc.

Duration

Penumbral half-duration

132.7 min

Partial half-duration

39.5 min

Half-durations are measured from greatest eclipse, so the full phase lasts twice as long.

Why eclipses come in seasons

The Moon's orbit is tilted about 5° to the ecliptic, so at most new and full moons it passes above or below the alignment. An eclipse needs the syzygy to coincide with the Moon being near one of the two nodes where the orbits cross. At this eclipse the Moon's ecliptic latitude was 0.932° — close enough to zero for the shadow to connect.

Times computed from VSOP87 and an ELP-derived lunar theory, validated against NOVAS and JPL Horizons to within one arcminute. See the alignment for yourself in the live simulation.