| Type: | penumbral |
| Date: | September 29, 2042 |
| Gamma: | −1.0261 |
| Magnitude: | −0.0011 |
| Saros Ser: | 118 |
| Saros No: | 53 of 73 |
| Penumbral: | 238 minutes, 32 seconds |
| P1: | 8:45:03 |
| Greatest: | 10:44:20 |
| P4: | 12:43:35 |
| Previous: | April 2042 |
| Next: | October 2042 |
A penumbral lunar eclipse will occur at the Moon’s ascending node of orbit on Monday, September 29, 2042,[1] with an umbral magnitude of −0.0011. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring only about 9 hours before perigee (on September 29, 2042, at 19:45 UTC), the Moon's apparent diameter will be larger.[2]
Earlier sources compute this as a 0.3% partial eclipse lasting under 12 minutes,[3] but newer calculations list it as a penumbral eclipse that never enters the umbral shadow.
The eclipse will be completely visible over eastern Australia, northeast Asia, and western North America, seen rising over east Asia and western Australia and setting over eastern North America and South America.[4]
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[5]
| Penumbral Magnitude | 0.95481 | |
| Umbral Magnitude | −0.00105 | |
| Gamma | −1.02617 | |
| Sun Right Ascension | 12h23m37.3s | |
| Sun Declination | -02°33'13.4" | |
| Sun Semi-Diameter | 15'57.9" | |
| Sun Equatorial Horizontal Parallax | 08.8" | |
| Moon Right Ascension | 00h25m38.7s | |
| Moon Declination | +01°38'07.3" | |
| Moon Semi-Diameter | 16'42.1" | |
| Moon Equatorial Horizontal Parallax | 1°01'18.0" | |
| ΔT | 80.7 s |
See also: Eclipse cycle. This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight. The first and last eclipse in this sequence is separated by one synodic month.
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two annular solar eclipses of Solar Saros 125.