| Type: | penumbral |
| Date: | August 17, 2027 |
| Gamma: | 1.2797 |
| Magnitude: | −0.5234 |
| Saros Ser: | 148 |
| Saros No: | 4 of 71 |
| Penumbral: | 218 minutes, 35 seconds |
| P1: | 5:24:29 |
| Greatest: | 7:13:43 |
| P4: | 9:03:03 |
| Previous: | July 2027 |
| Next: | January 2028 |
A penumbral lunar eclipse will occur at the Moon’s ascending node of orbit on Tuesday, August 17, 2027,[1] with an umbral magnitude of −0.5234. 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 about 1.9 days after apogee (on August 15, 2027, at 10:20 UTC), the Moon's apparent diameter will be smaller.[2]
The eclipse will be completely visible over North and South America, seen rising over Australia and the central Pacific Ocean and setting over west Africa.[3]
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Penumbral Magnitude | 0.54758 | |
| Umbral Magnitude | −0.52344 | |
| Gamma | 1.27974 | |
| Sun Right Ascension | 09h45m58.6s | |
| Sun Declination | +13°27'30.2" | |
| Sun Semi-Diameter | 15'47.8" | |
| Sun Equatorial Horizontal Parallax | 08.7" | |
| Moon Right Ascension | 21h43m58.8s | |
| Moon Declination | -12°24'40.9" | |
| Moon Semi-Diameter | 14'44.9" | |
| Moon Equatorial Horizontal Parallax | 0°54'07.8" | |
| ΔT | 72.8 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.
It is part of Saros cycle 148.
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two partial solar eclipses of Solar Saros 155.