Full Moon phase lighting up the sky this Tuesday (7); see the lunar calendar for October

The Moon reaches its full phase this Tuesday, October 7, 2025, at 12:47 AM, fully illuminating the night sky. The phenomenon, visible to the naked eye under clear skies, marks the peak of the lunar cycle, which lasts about 29.5 days. The full moon occurs when the Moon is positioned opposite the Sun relative to Earth, reflecting sunlight completely.

October’s lunar calendar includes the following main phases:

• Crescent moon: September 29, at 8:53 PM
• Full moon: October 7, at 12:47 AM
• Waning moon: October 13, at 3:12 PM
• New moon: October 21, at 9:25 AM
• Crescent moon: October 29, at 1:20 PM

These changes result from the gravitational interaction between Earth, Moon, and Sun, altering the visible portion of the satellite.

What is the lunar cycle

The lunar cycle, or synodic month, lasts an average of 29.5 days and is divided into four main phases. Each phase reflects the Moon’s relative position in its orbit around Earth. The new moon marks the start, when the satellite is between Earth and the Sun, becoming invisible. The full moon represents the moment of greatest visibility, with the entire lunar disk illuminated.

Effects of the full moon

The full moon directly influences tides, causing so-called spring tides. These tides show greater amplitude between high and low levels due to the gravitational alignment of Earth, Moon, and Sun. Research indicates that the full moon’s intense brightness affects animal behavior, such as corals and sea turtles, altering feeding and reproductive patterns. However, there is no scientific evidence proving direct impacts of lunar phases on human behavior, despite popular beliefs. Observing the full moon is ideal in areas with low light pollution, such as rural regions or beaches.

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Moon characteristics

The Moon, Earth’s only natural satellite, has a diameter of about 3,474 km, roughly a quarter of Earth’s size. Its average distance from Earth is 384,400 km, varying between 363,000 km (perigee) and 405,000 km (apogee) due to its elliptical orbit. Synchronous rotation causes the Moon to always show the same face to Earth. The opposite side, illuminated by the Sun, is only observable through space equipment. In the Southern Hemisphere, the crescent moon appears with the illuminated part on the left, while in the Northern Hemisphere, it’s on the right, due to the observation angle. This visual difference does not alter the satellite’s physical properties but influences cultural perceptions in different regions.

Observation and curiosities

October’s full moon is an excellent opportunity for astronomical observations, especially with amateur telescopes. Events like lunar eclipses, when the Moon passes through Earth’s shadow, may occur on some occasions but are not scheduled for this date. The full moon’s cultural influence is significant, appearing in myths, legends, and traditions throughout history.

Regional observation differences

In the Southern Hemisphere, the full moon appears “inverted” compared to the Northern Hemisphere due to the viewing angle. This peculiarity is noticeable in the crescent phase, when the illuminated portion forms an inverted “C” in the south.