As of July 12, 2026, the Moon is in its waning phase, with approximately 4% of its surface illuminated. According to data provided by the Instituto Nacional de Meteorologia (Inmet), this lunar cycle is part of a 29.5-day average progression that dictates the visible light of the satellite. Understanding these phases is essential for tracking the monthly lunar calendar and the physical position of the Moon relative to the Earth and the Sun.
The Lunar Cycle Schedule for July 2026
The current lunar month began on July 7, 2026, when the Waning Moon phase officially arrived at 16:30 (Brasília time). Following the current 4% illumination observed today, the cycle will transition into its next primary stage. Based on the official schedule from Inmet, the upcoming milestones are as follows:
- New Moon: July 14, at 06:45
- Waxing Moon: July 21, at 08:05
- Full Moon: July 29, at 11:37
Did you know? While there are four primary phases—New, Waxing, Full, and Waning—astronomers also track “interphases.” These include the waxing gibbous and the waning gibbous, which occur in the transitions between the four main stages.
Understanding the Four Primary Lunar Phases
The lunar cycle is defined by the interval between two New Moons, averaging 29.5 days. During this time, the Moon undergoes distinct changes in appearance caused by its orbital position.
New Moon and Waxing Phases
During the New Moon, the satellite positions itself directly between the Earth and the Sun. Because the illuminated side faces the Sun, the side facing Earth remains dark, making it invisible in the night sky. This phase is often associated with the start of a new cycle.
As the Moon moves into the Waxing phase, a thin arc of light becomes visible. This illumination increases night after night until the “First Quarter” is reached, where half of the Moon is visible. This stage is traditionally associated with development and growth.
Full Moon and Waning Phases
The Full Moon occurs when the Earth sits between the Sun and the Moon, allowing the entire face of the Moon directed at Earth to be illuminated. According to astronomical observation, this is the period of peak luminosity, when the Moon rises as the Sun sets.
Following the peak, the Waning phase begins. The visible surface area decreases gradually each night. When only half of the Moon remains visible, it reaches the “Last Quarter.” This phase continues until the light fades entirely, marking the end of the 29.5-day cycle and preparing for the next New Moon.
Frequently Asked Questions
How long does each lunar phase last?
Each of the four primary phases—New, Waxing, Full, and Waning—lasts for approximately seven days within the average 29.5-day lunar cycle.
Why is the Moon invisible during the New Moon phase?
The Moon is invisible to the naked eye because it is positioned between the Earth and the Sun, meaning the sunlight falls on the side of the Moon facing away from us.
What determines the visibility of the Moon?
Visibility is determined by the Moon’s orbital position relative to the Earth and the Sun, which dictates how much of the sunlit portion of the satellite is directed toward an observer on Earth.
Stay informed on the night sky. Do you track the lunar calendar for agricultural or personal planning? Share your experiences in the comments below or subscribe to our newsletter for monthly astronomical updates.
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