Moon phase today (09/07): check out the lunar cycle and curiosities of the month

This Sunday, September 7, 2025, the moon will be in the crescent phase, nearing the full moon, which occurs the following day, September 8. Visible across Brazil, this celestial event reflects the gravitational interplay between the moon, sun, and Earth, captivating astronomers and enthusiasts alike. Areas with clear skies, like Porto Alegre, will offer ideal conditions to observe the natural satellite, approximately 399,877 km from Earth. This moment is part of the 29.5-day lunar cycle, or lunation, guiding cultural rituals and agricultural activities. The crescent phase, known for its increasing brightness, resembles a “C” in the Southern Hemisphere. September’s lunar calendar also features other phases, with the new moon on the 15th and the waning moon starting on the 22nd, closing the month in the crescent phase again.

• Lunar cycle phases: new, crescent, full, and waning.
• Average phase duration: about 7 days.
• Visibility: the crescent moon is partially illuminated, ideal for nighttime observation.

This Sunday’s lunar phase is not only an astronomical event but also holds cultural and practical significance, influencing traditions and biodynamic agriculture.

What defines the crescent phase

The crescent phase occurs when the moon, orbiting Earth, partially reflects sunlight, increasing its visibility each night. At this stage, the moon is positioned between the new moon and the full moon, with the illuminated portion facing west. In the Southern Hemisphere, like Brazil, the crescent moon resembles a “C,” while in the Northern Hemisphere, it looks like a “D.” This phenomenon results from the angle of sunlight illuminating the moon’s visible surface.

The crescent is the second stage of the lunar cycle, starting with the new moon, when the satellite aligns with the sun and is nearly invisible. About seven days after the new moon, the crescent reaches peak visibility before transitioning to the full moon. On September 7, the moon will be one day away from the full phase, meaning its brightness will be near maximum, offering a visual spectacle for observers.

• Average moon distance from Earth: 384,400 km, varying due to its elliptical orbit.
• Illumination: about 90% of the visible surface will be lit this Sunday.
• Best observation time: after sunset, between 6 PM and 10 PM, depending on the location.

The crescent phase is particularly valued by photographers and amateur astronomers, who use the partial brightness to capture details of the lunar surface, such as craters and lunar seas.

Cultural and practical influence of lunar phases

Lunar phases significantly impact various cultures and practices worldwide. In Brazil, the crescent moon is associated with growth and renewal, considered ideal for planting in biodynamic agriculture. Farmers following the lunar calendar believe this phase promotes the development of leafy crops and fruits due to increased sap flow in plants. In popular traditions, the crescent moon is seen as a favorable time for starting new projects or cutting hair, believed to stimulate growth.

Culturally, the moon inspires rituals and celebrations in various communities. Indigenous groups, like the Guarani, use the lunar cycle to mark hunting, fishing, and harvesting periods. In religions like Candomblé, the crescent moon is linked to prosperity and fertility, a time for offerings and requests.

• Agricultural practices: planting leafy vegetables is recommended during the crescent moon.
• Popular traditions: cutting hair or nails to promote growth.
• Spiritual rituals: offerings in Afro-Brazilian religions to attract prosperity.
• Cultural astronomy: lunar observation events in urban and rural communities.

These influences highlight how the moon, though an astronomical phenomenon, is deeply tied to human practices, from science to spirituality.

How to observe the moon this Sunday

Observing the crescent moon on September 7 will be enhanced in areas with clear skies, especially in cities with low light pollution. In Porto Alegre, for instance, sunset is expected around 6:15 PM, with the moon visible shortly after in the western sky. Astronomers recommend using binoculars or small telescopes to view details like the Tycho and Copernicus craters.

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Choosing the right location is key for good observation. Rural areas or parks away from urban centers provide better conditions, as artificial lighting can obscure visibility. Astronomy apps, like Stellarium or SkySafari, can help locate the moon and identify nearby constellations.

• Observation tips:
  • Choose spots with low light pollution, like rural areas or beaches.
  • Use 7×50 binoculars or entry-level telescopes for surface details.
  • Check apps to track the moon’s exact position in the sky.
  • Avoid cloudy or high-humidity days, which can hinder visibility.

Lunar observation is an accessible activity, requiring no expensive equipment and suitable for families, sparking interest in astronomy.

September’s lunar cycle in detail

September 2025’s lunar calendar began with a full moon on the 1st, when the satellite was fully illuminated, visible all night. After this peak brightness, the moon entered the waning phase from the 2nd, with its illuminated portion gradually decreasing. On the 8th, the full moon returns, marking the cycle’s brightest moment. The new moon, when the satellite is nearly invisible, is set for the 15th, followed by the crescent phase again by month’s end.

Each lunar phase has unique traits. The new moon is ideal for stargazing, as the lack of lunar light reduces sky interference. The full moon is perfect for outdoor events, like night hikes, due to its intense brightness. The waning moon is associated with introspection and cycle completion in spiritual practices.

• September lunar calendar:
  • September 1: Full moon.
  • September 2–7: Waning moon.
  • September 8: Full moon.
  • September 15: New moon.
  • September 22–30: Crescent moon.

This cycle reflects the lunation’s regularity, lasting about 29.5 days, influencing navigation, fishing, and traditional agriculture.

Moon facts and influence

The moon is not just an astronomical object but a central element in various fields of human knowledge. Its gravity affects ocean tides, a phenomenon known as lunar tides, impacting fishing and navigation. Scientific studies explore links between lunar phases and human behavior, though no consensus exists on effects like increased births during the full moon.

In popular culture, the moon inspires myths and legends. In Brazil, stories like the “Saci-Pererê” tie the full moon to supernatural events. In cultures like the Chinese, the Mid-Autumn Festival celebrates September’s full moon with lanterns and mooncakes, symbolizing unity and prosperity.

• Curious facts:
  • The moon is the only celestial body humans have visited, in 1969, with Apollo 11.
  • The term “lunatic” stems from ancient beliefs that the full moon affected sanity.
  • High tides are stronger during full and new moons.
  • The moon drifts 3.8 cm farther from Earth each year.

These facts underscore the moon’s enduring fascination, bridging science, culture, and history.