Prepare to be amazed as we journey through the cosmos tonight, exploring three breathtaking lunar craters, each named after remarkable astronomers and philosophers who significantly contributed to our understanding of the universe. The view of Earth's moon is nothing short of spectacular, especially when gazed upon through the lens of a telescope, which magnifies the stunning array of craters marking its ancient surface.
These craters are more than mere geographical features; they are powerful reminders of the cataclysmic events that shaped the moon. Each impact site tells a story of violent collisions that carved massive basins and scattered debris across the face of our celestial neighbor. Join us as we delve into the fascinating details of three such marvels: the Eudoxus Crater, the Aristoteles Crater, and the Cassini Crater. These locations make for superb observations during the first quarter moon phase on January 25th.
Eudoxus Crater
As the sun sets on January 25, direct your gaze to the moon, where you'll see its right half brilliantly illuminated while the left remains shrouded in shadow. Located in the northeastern section of the lunar surface, the Eudoxus Crater measures an impressive 42 miles (67 kilometers) across and resides above the ancient, solidified lava plain of Mare Serenitatis.
This vast impact crater is named after Eudoxus of Cnidus, an esteemed ancient Greek astronomer and mathematician. Eudoxus endeavored to explain planetary motion by creating a model of our solar system, positioning Earth at the center, surrounded by concentric spheres that dictated the movement of celestial bodies. Interestingly, the 2.1-mile (3.4 km) deep crater carries his name despite having formed millions of years before Eudoxus developed his theories, silently witnessing the evolution of our understanding from a geocentric to a heliocentric viewpoint. On the evening of January 25, a large portion of the crater's eastern interior will be cloaked in darkness, giving it a dramatically unique appearance not visible during other lunar phases.
Aristoteles Crater
Next, shift your focus slightly northward from Eudoxus to spot the 54-mile (87 km) Aristoteles Crater, which lies along the southern boundary of Mare Frigoris, known as the Sea of Cold. Similar to Eudoxus, the interplay between the moon and sunlight will create shadows across parts of the Aristoteles Crater, accentuating the rugged terrain surrounding its central basin, which is adorned with hill-like features.
Named after the illustrious Greek philosopher and astronomer Aristotle, who lived from 384 to 322 BC, this crater shares a legacy of celestial curiosity. Aristotle also believed in a geocentric universe and proposed his own model in which the sun, stars, and planets revolved around Earth, all within solid crystalline spheres moved by an external 'Prime Mover' situated in the outermost sphere. Notably, he was among the first to recognize the spherical nature of Earth, drawing conclusions from the curved shadow cast on the lunar surface during lunar eclipses.
Cassini Crater
For our final destination, we will venture towards the lunar terminator, crossing over the Montes Caucasus mountain range to reach the Cassini Crater, which is located on the eastern edge of Mare Imbrium, or the Sea of Showers, approximately 40 degrees above the lunar equator.
This significant impact site spans 35 miles (57 km) and bears the name of Jean-Dominique Cassini, a renowned astronomer from the 17th and 18th centuries. His extensive work included detailed planetary observations and calculating Mars's rotational speed, alongside the discovery of several moons of Saturn: Rhea, Tethys, and Dione.
While only the outer rim of the Cassini Crater is visible, the interior basin has been filled with molten lava that cooled millions of years ago, altering its original appearance. Additionally, two younger craters have formed within Cassini's expanse, their basins enveloped in darkness around the time of the first quarter moon, making them captivating subjects for telescope enthusiasts.
Are you ready to embark on your lunar exploration? Don't forget to check out our comprehensive guide on how to observe the lunar surface using a telescope. If you're considering upgrading your equipment, browse through our recommendations for the best binoculars and telescopes that cater to every budget and experience level.
Editor's Note: We encourage you to share your lunar astrophotography with our readers! Please send your photos, along with your name and location, to spacephotos@space.com.
Anthony Wood joined Space.com in April 2025, bringing with him a wealth of experience from outlets like IGN, New Atlas, and Gizmodo. He holds a deep passion for the night sky, science, and human space exploration, eagerly anticipating the day when astronauts will once again tread upon the moon.
