Lunar eclipse: Partial — 21 December 1991
Global eclipse conditions
A partial lunar eclipse begins with the penumbral phase at 23:29 (GMT-9). The partial phase starts at 01:01, when Earth’s umbra begins to cover the Moon. Maximum occurs at 01:36, with up to 4% of the lunar disk in the umbra. The partial phase ends at 02:08, and the eclipse ends at 03:39.Eclipse phase times at your location
| Phase | Time (GMT-9) | Local visibility |
|---|---|---|
| Penumbral eclipse begins | 23:29 | 👁 |
| Partial eclipse begins | 01:01 | 👁 |
| Maximum occurs at 01:36. The eclipse is partial, with 4% umbral coverage. | ||
| Partial eclipse ends | 02:08 | 👁 |
| Penumbral eclipse ends | 03:39 | 👁 |
Global visibility map
Local eclipse conditions at (GMT-9)
Relative positions of Earth’s shadow and the Moon
Local eclipse parameters
| Phase | |
| Penumbral magnitude | |
| Umbral magnitude | |
| Penumbral coverage | |
| Umbral coverage | |
| Umbra diameter, km | |
| Penumbra diameter, km | |
| Distance from the shadow axis, km |
Observation parameters
| Time | |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Moon elevation | |
| Moon azimuth |