The moon enters its Third Quarter phase today, September 14, 2023, revealing 49% of its surface illuminated from Earth’s perspective. This phase marks day 22 of the lunar cycle, which spans approximately 29.5 days, according to data from NASA. As the moon orbits our planet, different portions are lit by the Sun, resulting in a series of distinct visibility phases.
During the Third Quarter, the moon appears as a half-moon, and while the illumination is decreasing, there remains much to observe in the night sky. Stargazers can spot notable features such as the Tycho and Copernicus craters without any equipment. For those equipped with binoculars, the Gassendi and Alphonsus craters become visible, while telescope users can explore the Schiller Crater and the Fra Mauro Highlands.
Upcoming Lunar Events
The next full moon will occur on October 6, 2023, following a recent full moon on September 7, 2023. These lunar phases are a result of the moon’s orbit around Earth, changing the angles between the Sun, Moon, and Earth, which defines how we perceive its light.
Understanding moon phases is essential for astronomy enthusiasts and casual observers alike. As the moon progresses through its cycle, it transforms from a New Moon—when it is positioned between Earth and the Sun, making it invisible—to a Full Moon, where its entire face is illuminated and fully visible.
The lunar cycle consists of eight distinct phases, each following a predictable pattern:
– **New Moon**: The moon is not visible as it is positioned between the Earth and the Sun.
– **Waxing Crescent**: A small crescent of light appears on the right side.
– **First Quarter**: Half of the moon is illuminated on the right side, resembling a half-moon.
– **Waxing Gibbous**: More than half is illuminated, yet it is not fully lit.
– **Full Moon**: The entire face of the moon is visible and illuminated.
– **Waning Gibbous**: The moon begins to lose light on the right side.
– **Last Quarter (or Third Quarter)**: Similar to the First Quarter, but this time the left side is lit.
– **Waning Crescent**: A thin sliver remains visible on the left side before the moon returns to darkness.
As we observe tonight’s Third Quarter moon, it serves as a reminder of the celestial mechanics at play in our universe. Whether for scientific interest or casual enjoyment, stargazing offers a unique opportunity to connect with the cosmos.
