Key Facts About the January 2019 Total Lunar Eclipse
A total lunar eclipse occurred on January 20–21, 2019, producing a widely observed 'blood moon' for viewers across the Americas, Europe, and parts of Africa and Asia. This evergreen explainer summarizes verified timing, visibility, and scientific causes, and provides a concise comparison table for quick reference.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Calendar Date | 20–21 January 2019 | NASA eclipse records |
| Event Type | Total lunar eclipse (Supermoon) | NASA eclipse bulletins |
| Umbral Magnitude | ~1.19 | NASA Five Millennium Catalog |
| Totality Duration | 61 minutes 54 seconds | NASA eclipse data |
| Penumbral Start (UTC) | ~22:37 | NASA interactive maps |
| Umbral Start (UTC) | ~23:41 | NASA interactive maps |
| Mid-Totality (UTC) | ~00:12 (21 Jan) | NASA eclipse data |
| End of Umbral (UTC) | ~01:03 (21 Jan) | NASA eclipse data |
| Penumbral End (UTC) | ~02:48 | NASA eclipse data |
| Supermoon Effect | Moon near perigee, up to ~14% larger and ~30% brighter | NASA Moon orbit data |
Why a Lunar Eclipse Occurs
A lunar eclipse happens when the Moon passes through Earth’s shadow, which requires precise syzygy—Sun, Earth, and Moon nearly aligned with Earth in the middle. Because the Moon’s orbit is inclined about 5 degrees relative to Earth’s orbital plane, eclipses do not occur every month. A total lunar eclipse can last up to about 100 minutes and is visible from anywhere on the night side of Earth, unlike a solar eclipse, which is visible only along a narrow path. The familiar red color of a total lunar eclipse, often called a blood moon, arises because Earth’s atmosphere bends some sunlight into the shadow while filtering shorter blue wavelengths, projecting mainly red light onto the lunar surface.
Visibility During the January 2019 Event
The eclipse was well positioned for observers across nearly all of North and South America, Greenland, Iceland, Ireland, the United Kingdom, and northern and western Europe. Viewers in some parts of Africa and Asia saw the later stages, including partial and penumbral phases. For many locations, the Moon was high in the sky during mid-totality after midnight, offering favorable viewing conditions. Weather and local horizon obstructions ultimately determined how clearly individuals could see each phase, but the geographic footprint ensured a broad audience for the total phase.
Stages and Timing of a Total Lunar Eclipse
Understanding the sequence helps observers identify what they are seeing and anticipate timing. The table below summarizes the principal contact times for the January 2019 event in Coordinated Universal Time (UTC), which convert to local time depending on your zone.
| Stage | Approximate Time (UTC) | What an Observer Sees |
|---|---|---|
| Penumbral Eclipse Begins | 22:37 | Very subtle shading on the Moon’s edge |
| Partial Eclipse Begins (Umbra) | 23:41 | Dark part of Earth’s shadow starts covering the Moon |
| Totality Begins | 00:12 (21 Jan) | Entire Moon immersed in Earth’s umbra; reddish hue visible |
| Mid-Totality | 00:12 | Maximum eclipse; Moon often appears coppery red |
| Totality Ends | 01:03 | Moon begins to leave Earth’s umbra |
| Partial Eclipse Ends | 01:48 | Only penumbral shading remains |
| Penumbral Eclipse Ends | 02:48 | Subtle shading disappears; event concludes |
Science of the Reddish Appearance
During totality, the Moon can appear anywhere from dark gray to bright coppery orange, depending on Earth’s atmospheric conditions at the time. Fine ash or aerosols from large volcanic eruptions or widespread wildfires can deepen the red or even cause the Moon to become very dark and difficult to see. By contrast, a cleaner stratosphere often yields a vivid orange or copper color. This variability means each eclipse can look somewhat different, and descriptions should not be treated as predictions for future events.
How January 2019 Compared to Other Blood Moons
The January 2019 total lunar eclipse was notable for occurring during a supermoon phase, where the Moon is near perigee—its closest approach to Earth during its orbit. This made the Moon appear somewhat larger and brighter than an average total lunar eclipse. The combination of a supermoon and a long totality (~62 minutes) made the event visually distinctive. Understanding whether an eclipse occurs near perigee or apogee helps explain variations in apparent size and brightness from one event to the next.
Observing and Photographing a Lunar Eclipse
No special filters are required to view a lunar eclipse with the naked eye, and it is entirely safe to do so. Binoculars or a small telescope can enhance detail, revealing subtle color gradients and lunar surface features even during totality. For photography, modern smartphones can capture acceptable results using telephoto zoom or tripod-mounted cameras for sharper, more detailed images. Correct exposure is important; as totality progresses, you may need to increase ISO or lengthen shutter speed. Reviewing previous images and settings before the next eclipse helps amateurs and enthusiasts produce more consistent results.