The Moon, in its cosmic dance around Earth and the Sun, begins a new cycle on September 22, 2025. On this Monday, the natural satellite is in the New Moon phase, with 0% visibility in the sky, according to data from the National Institute of Meteorology (Inmet). This moment marks the start of a lunar cycle lasting approximately 29.5 days, during which the Moon passes through its four main phases: New, Crescent, Full, and Waning. Each phase, visible in different ways in the sky, sparks curiosity and influences everything from agriculture to cultural traditions worldwide.
The New Moon phenomenon occurs when the Sun-illuminated face is entirely opposite Earth, making the satellite invisible to the naked eye. This event, which began at 4:54 PM on September 21, extends until September 29, when the Moon transitions to the Crescent phase at 8:53 PM, per Inmet. The absence of lunar light in the sky during the New Moon invites stargazers to enjoy stars and other celestial bodies, less obscured by the satellite’s brightness. For many, this moment also symbolizes renewal and new beginnings in spiritual and cultural practices.
The lunar cycle, beyond its visual beauty, has practical and symbolic impacts. It has guided planting, fishing, and celebrations for centuries. In the case of the New Moon, farmers, for instance, use this phase to plan the cultivation of certain crops, while astronomers prepare to observe constellations with greater clarity.
- Lunar cycle phases: New, Crescent, Full, and Waning, with four intermediate phases.
- Average cycle duration: Approximately 29.5 days, according to Inmet.
- New Moon visibility: 0%, due to the illuminated face being opposite Earth.
- Next phase: Crescent Moon, starting September 29, 2025, at 8:53 PM.
How the New Moon affects sky observation
The New Moon, with its complete lack of visibility, is a special moment for amateur and professional astronomers. During this phase, the night sky is darker, making it easier to observe stars, planets, and even distant galaxies. Astronomy clubs in cities like São Paulo and Rio de Janeiro are already planning events to take advantage of the clear sky on September 22, 2025, encouraging the public to explore the universe with telescopes. This condition is ideal for long-exposure photography, capturing details of celestial bodies that would be obscured by lunar light in other phases.
On the other hand, the Moon’s absence can limit some activities. Artisanal fishers, for example, report greater difficulty navigating at night during the New Moon due to less natural light. Conversely, the phase is favorable for fishing certain marine species that come closer to the surface on darker nights.
- Optimal conditions for stargazing during the New Moon.
- Activities like astronomical photography gain prominence.
- Fishers adjust strategies due to low natural light.
The lunar cycle and its phases in September 2025
September 2025 features a well-defined lunar calendar, according to Inmet data. The Full Moon occurred on September 7 at 3:08 PM, illuminating the sky with 100% visibility. The Waning Moon began on September 14 at 7:32 AM, followed by the New Moon on September 21 at 4:54 PM. The next phase, the Crescent Moon, is scheduled for September 29 at 8:53 PM. These transitions, marked by gradual changes in the satellite’s appearance, result from the Moon’s orbit around Earth and its relationship with sunlight.
Each phase has unique characteristics. The Full Moon, for instance, is the moment of greatest visibility, when the illuminated face is fully turned toward Earth. The Waning Moon marks the gradual reduction of the lit area, setting the stage for the cycle’s restart with the New Moon. In addition to the four main phases, there are intermediate phases, such as First Quarter and Waning Gibbous, which complement the cycle and offer nuances in lunar observation.
- Full Moon: September 7, at 3:08 PM, with maximum visibility.
- Waning Moon: September 14, at 7:32 AM, with gradual light reduction.
- Crescent Moon: September 29, at 8:53 PM, start of new illumination.
- Intermediate phases: Include First Quarter and Waning Gibbous.
Cultural and practical influences of the New Moon
The New Moon carries profound meanings in various cultures. In Brazilian indigenous traditions, such as among the Guarani people, it is seen as a time for introspection and connection with nature. Renewal rituals, like herbal baths, are common in some communities during this phase. In urban settings, astrologers and spiritual practitioners associate the New Moon with new projects and intentions, leveraging its symbolism of renewal.
In agriculture, the phase is considered ideal for planting crops that grow underground, like tubers. Agronomic studies suggest that the New Moon’s lower gravitational influence may favor root development. In maritime traditions, fishers on Brazil’s coast, such as in the Northeast, adjust their schedules to capitalize on fish movement during darker nights.
- Symbolism: Renewal and new beginnings in spiritual practices.
- Agriculture: Ideal for planting tubers like potatoes and cassava.
- Fishing: Specific species approach the surface during the New Moon.
- Cultural rituals: Herbal baths and meditations in traditional communities.
Curiosities about the lunar cycle
The lunar cycle has fascinated humanity for millennia. Beyond its scientific significance, it appears in myths, legends, and daily practices. The Moon, though lacking its own light, reflects sunlight to create a visual spectacle in the sky. Its influence extends beyond the visible, affecting tides, animal behavior, and even festival calendars in various cultures.
In Brazil, the lunar cycle is especially relevant in rural areas, where farmers still follow the lunar calendar to plan crops. For example, the New Moon is seen as a time of lower lunar activity, ideal for pruning and soil preparation. In urban areas, sky observation during this phase is gaining popularity with the rise of astronomy events and apps that help identify constellations.
- Tidal influence: The New Moon intensifies tides due to alignment with the Sun.
- Astronomy apps: Tools like Stellarium aid in stargazing.
- Rural traditions: Use of the lunar calendar for farming and pruning.
- Mythology: The New Moon is linked to gods and spirits in various cultures.
