What Makes a Super Moon and Why March 20 Qualifies
A super moon occurs when a full moon coincides with or is very close to lunar perigee, the point in the Moon’s elliptical orbit nearest to Earth. On or around March 20, the full moon aligns with perigee, making the Moon appear slightly larger and brighter than an average full moon. This is a predictable orbital effect, not a dramatic astronomical ‘event’ that changes Earth’s tides or geology in unusual ways, though the enhanced illumination is a useful prompt for observation and photography. Understanding the mechanics behind the super moon on March 20 helps distinguish real effects from exaggerated claims.
Defining Super Moon: Criteria and Common Thresholds
There is no single official definition of a super moon; the term is broadly used in popular astronomy. Commonly, a super moon refers to a full moon (or new moon) that occurs within 90 percent of perigee distance, often described as a full moon at or near closest approach. Key reference points include:
- Lunar perigee distance varies because the Moon’s orbit is elliptical, typically ranging from about 356,500 km to 406,700 km from Earth.
- Full moon within roughly 363,000 km of Earth is often considered a super moon by many astronomy communicators.
- Different thresholds exist across sources, but the consensus is that a visually noticeable increase in apparent size and brightness occurs when the full moon is near perigee.
Perigee and Full Moon Timing
The exact moment of perigee and full moon can differ by hours. For the super moon on March 20, the full moon phase and perigee occur close together, which is what creates the noticeably bright and relatively large-looking Moon. Check local moonrise and moonset times to plan viewing, because a super moon is best observed when the Moon is above the horizon and free of heavy cloud cover.
Visibility and Timing for March 20
Visibility of the super moon on March 20 depends on local sky conditions, including cloud cover, light pollution, and horizon obstructions. In regions where the Moon is visible all night, observers can expect to see a bright full moon with a subtle size increase compared with a full moon at apogee. For the most accurate local timing, consult up‑to‑date moonrise and moonset tables for your location. The super moon on March 20 will rise around sunset and set around sunrise, offering many hours of observation.
Observing and Photographing a Super Moon
Best Practices for Visual Observation
To get the most from the super moon on March 20:
- Choose a location with an unobstructed view of the eastern horizon at moonrise.
- Use binoculars or a small telescope to enhance detail if desired.
- Allow your eyes to adapt to darkness for at least 15–20 minutes before judging faint features.
- Note that atmospheric conditions, such as haze or clouds, can influence apparent size and brightness.
Photography Tips
Photographing a super moon benefits from planning and simple techniques. Use a telephoto lens to emphasize the Moon’s size relative to foreground objects, and consider the rule of thumb for shutter speed to avoid blur from Earth’s rotation. A tripod reduces camera shake, and manually exposing for the Moon helps retain detail in both the lunar surface and the surrounding sky. Bracketing exposure or using the histogram can help you capture a well‑balanced image. Remember that modest equipment can yield satisfying results when the Moon is high and steady.
Comparing March 20 Super Moon with Typical Full Moons
| Attribute | March 20 Super Moon (approximate) | Average Full Moon | Source Type |
|---|---|---|---|
| Moon–Earth distance at perigee | ~356,500 km (perigee) | ~369,000 km (typical near full moon) | Orbital data |
| Apparent size increase versus apogee full moon | Up to ~14% larger by diameter | Baseline | Calculated from orbital geometry |
| Brightness increase versus apogee full moon | Up to ~30% brighter | Baseline | Illumination and optics |
| Timing of full moon on March 20 | Varies by time zone; occurs close to perigee | Independent of perigee timing | Lunar phase and ephemerides |
Common Misconceptions and Reality Check
Claims sometimes circulate that a super moon can cause extreme tides, natural disasters, or significant behavioral changes. In reality, lunar distance variations do affect tides—perigean tides are somewhat higher—but these effects are modest and routine. No credible evidence links super moons to earthquakes, volcanic activity, or major weather events. The super moon on March 20 is a good opportunity for observation and photography, but it does not represent an unusual threat or anomaly. Keeping claims in line with verifiable data avoids confusion and keeps the experience grounded in science.
Cultural and Historical Context Around Super Moons
The idea of assigning names or special significance to full moons dates back to Indigenous, colonial, and early modern traditions that used the Moon to track seasons. Many cultures have long noted full moons that coincided with or followed perigee, though the modern popularity of the term super moon is recent. Contemporary interest in the super moon on March 20 blends these older patterns of skywatching with accessible digital tools that let people forecast and share lunar events. This continuity between historical practice and modern technology enriches public engagement without requiring new myths.
Planning Ahead: Future Super Moon Opportunities
Because super moons are predictable, skywatchers can prepare for future occurrences by tracking perigee and full moon times. The super moon on March 20 is one example of a recurring pattern that offers regular chances to practice observation and photography. Building a simple calendar of upcoming full moons and perigee dates turns each super moon into a routine event rather than a fleeting novelty. Advances in forecasting and global data sharing make it easier than ever to plan accurate, local observations.