Inmet records Moon reaching 2% visibility in September 2026

The Moon reached 2% visibility across skies in Brazil on September 11, 2026, during its waning cycle according to technical calculations by Instituto Nacional de Meteorologia. This minimal illuminated fraction signals an imminent change in the celestial progression observed over the country.

The satellite commenced its waning phase on September 4, 2026, at 04:52 local Brasília time. Skies darkened progressively across South America following that morning milestone. Calculations confirmed the shift.

Calendar determines lunar progression across Brazil in September 2026

Astronomical records compiled by Instituto Nacional de Meteorologia outline each lunar development scheduled throughout the ninth month of 2026. The next New Moon arrives on September 11, 2026, at 00:27, before the First Quarter emerges at 17:44 on September 18, 2026.

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The Full Moon reaches peak illumination at 13:50 on September 26, 2026, to conclude the scheduled phase changes calculated for the monthly window. Official astronomical ephemerides establish every scheduled transition hour across Brazilian territory. Observers track these timelines closely.

• Waning Moon: September 4, 2026, at 04:52
• New Moon: September 11, 2026, at 00:27
• First Quarter: September 18, 2026, at 17:44
• Full Moon: September 26, 2026, at 13:50

Every phase spans approximately seven days on the calendar. This rhythm governs monthly cycles.

Sun and Earth positioning governs variations in satellite illumination

A lunation denotes the overall elapsed interval between two consecutive new moons, lasting an average of 29.5 days with slight mechanical variations along the orbital trajectory calculated by Instituto Nacional de Meteorologia as the natural satellite completes four primary arrangements relative to both the Earth and the Sun while surface brightness drops steadily. Light decreases continuously during this journey. The system rotates smoothly.

During the New Moon stage, the celestial body sits directly between the Earth and the Sun, aiming its illuminated half exclusively toward the star while keeping its dark side turned toward observers on our planet. This precise alignment prevents visual observation in the night sky.

Intermediate stages separate four primary milestones in space

The lunar journey running between the new and full phases contains distinct intermediate stages designated as the waxing crescent and waxing gibbous. When illumination reaches half of the visible surface facing the Earth, astronomy designates this milestone as the First Quarter. That balanced shape comes before the brightest night of the month.

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The Third Quarter happens when only fifty percent of the lunar disc stays visible to watchers on Earth. That balance precedes final darkening.

Luminosity drops toward upcoming astronomical transition

The Full Moon occurs when Earth positions itself straight between the Sun and the Moon, allowing the lunar hemisphere facing our globe to capture full solar illumination. During that stage, the bright sphere ascends along the horizon at the exact moment the Sun sets in the west. Sunlight strikes the crust directly.

Shrinking light drives the movement across the waning gibbous and third quarter stages right until the New Moon arrives on September 11, 2026. That minute starts another sequence.