Moon Phase Today: Waning Crescent & Next Full Moon Date | NASA Guide

If you’re looking up at the night sky tonight, Sunday, March 15, 2026, you’ll likely demand binoculars or a telescope to catch a glimpse of the Moon. As we move closer to the New Moon phase, the illuminated portion visible from Earth is shrinking, making it a subtle sight. Currently, approximately 16% of the Moon is lit, classifying it as a Waning Crescent phase. While detailed surface viewing is challenging without optical aid, patient observers might be able to spot the Grimaldi Basin.

Understanding the Waning Crescent Phase

The Waning Crescent is one of eight distinct phases the Moon cycles through in roughly 29.5 days as it orbits Earth. This cycle, as explained by NASA, isn’t about the Moon changing shape, but rather the changing angles at which we view the sunlit portion of the Moon. Because the Moon is tidally locked with Earth, we always see the same side, but the amount of that side illuminated by the Sun varies dramatically throughout the month.

A Closer Look at Lunar Phases

Let’s break down the complete lunar cycle, starting with the New Moon. During the New Moon, the Moon is positioned between the Earth and the Sun, meaning the side facing us is unlit and essentially invisible. As the Moon continues its orbit, a sliver of light begins to appear, marking the Waxing Crescent phase. This crescent gradually grows until it reaches the First Quarter phase, where half of the Moon is illuminated.

The illuminated portion continues to expand through the Waxing Gibbous phase, becoming more than half full, until it reaches the Full Moon – when the entire face of the Moon is brightly lit. After the Full Moon, the process reverses. The illuminated portion begins to shrink during the Waning Gibbous phase, followed by the Third Quarter (or Last Quarter) phase, where again half of the Moon is lit, but on the opposite side from the First Quarter. Finally, the Moon returns to the Waning Crescent phase before completing the cycle and becoming a New Moon once more.

What Makes the Grimaldi Basin Special?

For those with binoculars or a small telescope, the Waning Crescent phase offers a chance to observe the Grimaldi Basin. This is a large, dark impact basin located on the far side of the Moon, though portions are visible from Earth. The basin’s dark coloration is due to its floor being covered in basaltic lava flows, remnants of ancient volcanic activity. NASA’s Daily Moon Guide provides detailed views of the lunar surface, including features like the Grimaldi Basin, using data from the Lunar Reconnaissance Orbiter (LRO).

Libration and Our View of the Moon

While we always see the same side of the Moon, it’s not *exactly* the same view every time. A phenomenon called libration causes slight wobbles in the Moon’s apparent position, allowing us to see a little bit beyond the edges over time. NASA’s Scientific Visualization Studio (SVS) creates annual visualizations of the Moon’s phase and libration, showing these subtle shifts in orientation and illumination. These visualizations are based on hourly renderings, providing a precise depiction of the Moon’s appearance throughout the year.

Looking Ahead: The Next Full Moon

If you miss this current view of the Waning Crescent, don’t worry – the lunar cycle is continuous. The next Full Moon in North America is predicted to occur on April 1, 2026. This will offer a dramatically different viewing experience, with the entire lunar disk brightly illuminated. Full Moons are often associated with increased cultural and artistic expression, and are a popular time for lunar observation events like International Observe the Moon Night, organized by NASA.

The Significance of Studying the Moon

Understanding the Moon’s phases and features isn’t just about appreciating its beauty. It’s also crucial for scientific exploration. NASA’s Lunar Reconnaissance Orbiter (LRO), mentioned previously, has been instrumental in creating high-resolution maps of the lunar surface, identifying potential landing sites for future missions, and studying the Moon’s composition. These efforts are particularly crucial as NASA’s Artemis program aims to return humans to the Moon and establish a sustainable lunar presence. The data collected from LRO and other missions will help scientists learn more about the Moon’s history, its resources, and its potential for supporting long-term space exploration.

Future Lunar Observations and Data Availability

NASA continues to provide resources for observing the Moon, including the Daily Moon Guide and visualizations from the SVS. The SVS produces annual visualizations of the Moon’s phase and libration, dating back to 2011, allowing users to explore the Moon’s appearance at any given time. These resources are freely available to the public, encouraging citizen science and fostering a deeper understanding of our celestial neighbor. As the Artemis program progresses, we can expect even more detailed data and imagery of the Moon to grow available, further enhancing our knowledge of this fascinating world.