Supermoon marks the beginning of December 2025 with intense brightness in the night sky. The phenomenon occurs on the 4th, when the full Lua reaches perigee, its closest point to the Terra, around 357 thousand kilometers away. Observadores around the world will be able to notice the satellite 14% larger and 30% brighter than usual, visible throughout the night in the constellation of Touro.
This supermoon ends a series of three similar events in the year, following those that occurred in October and November. Especialistas highlight that the alignment favors observations in places with low light pollution. No Hemisfério Sul, the spectacle is highlighted by its proximity to the summer solstice, which begins the hottest period of the year.
Other events complement the month, such as conjunctions between Lua and star clusters.
- Conjunction Lua-Pleiades on December 4, visible in the northwest during the early morning hours.
- The Pupidas-Velids meteor shower peaks on December 7, with up to 10 meteors per hour from 9pm.
- Geminidas shower on December 14, capable of producing up to 150 meteors per hour at its peak.
Celestial conjunctions guide the look at the beginning of the month
The conjunction between Lua and Plêiades occurs in the early hours of December 4, in a northwest direction. Esse star cluster, known as M45, appears close to the satellite in full phase, creating a clear view in the constellation of Touro. Observadores must aim at the western horizon after dark to capture the alignment, which lasts a few hours.
Planets also participate in visual approaches. On December 7, Lua aligns with Júpiter before dawn in the constellation Gêmeos. The gas giant shines brightly, making it easy to spot without equipment. Essas optical illusions, caused by terrestrial perspectives, highlight real distances of millions of kilometers in space.
Pupidas-Velids rain activates the celestial southeast
The Pupidas-Velids meteor shower peaks on December 7, starting at 9pm local time. Fragmentos of comet 26P/Grigg-Skjellerup crosses the Earth’s atmosphere, generating luminous traces in the southeast direction. Estimativas indicate up to 10 meteors per hour in ideal conditions, with speeds of around 30 kilometers per second.
This activity takes place annually in December and benefits Hemisfério Sul due to the position of the radiant. Astrônomos recommend observation in rural areas to maximize visibility. The event coincides with the Lua-Jupiter conjunction, adding layers to the nighttime spectacle.
The origin of the rain dates back to cometary debris accumulated along orbits passed by Terra. Registros histories show annual variations, but 2025 presents favorable conditions without significant lunar interference. Observadores experts note that occasional bolides can produce varying colors due to mineral compositions.
Fixed Star Alignments in Mid-December
On December 10, Lua approaches the star Regulus, one of the brightest in the sky, forms an apparent pair with the growing satellite, making identification easier for beginners. The phenomenon lasts until dawn and serves as a reference for mapping other nearby constellations.
On December 18, during the aurora, Lua aligns with Mercúrio and the star Antares in the constellations of Ofiúco and Escorpião. Mercúrio, at maximum elongation, appears more separated from Sol, improving its observation in the east. Antares, with a reddish tone, contrasts with the silver glow of the planet and Lua.
These alignments occur due to independent but synchronized orbits from terrestrial perspectives. Small Telescópios reveal details like lunar craters and planetary phases.
Peak of Geminidas dominates the mid-month sky
Geminidas reaches its maximum on December 14th, from 10pm in the northeast direction. Essa rain, originating from asteroid 3200 Phaethon, can generate up to 150 meteors per hour at ideal peaks. Meteoros arise from the constellation of Gêmeos, with white, yellow or colored features due to traces of sodium and calcium.
The annual intensity of the Geminidas makes them the highlight of December, surpassing other rains in regularity. In 2025, Lua in a waning quarter interferes minimally, favoring prolonged observations. Locais with dark skies, such as national parks, record the highest counts.
History of observations shows a gradual increase since the 19th century, attributed to the greater orbital stability of the parent asteroid. Bólidos, or fireballs, occur in 20% of events, lighting up the sky for seconds. The speed of 35 kilometers per second produces short but vivid contrails.
Moderate speed differentiates Geminidas from faster rains, such as Perseidas.
Solstice and final conjunctions mark closure
The summer solstice on Hemisfério Sul begins on December 21st at 12:03 pm Greenwich time. Esse astronomical landmark tilts the Earth’s axis, prolonging the days of light in the global south. Efeitos include higher tides and altered weather patterns observable at local stations.
On December 26, Lua conjunction with Saturno appears in the early evening, northwest in the constellation of Peixes. Saturno, with rings visible in telescopes, forms a duo with the crescent moon. Observation benefits equatorial regions due to the planet’s nighttime elevation.
These final December events prepare the sky for 2026, with Quadrantidas in January. Registros annuals confirm consistent visibility, regardless of hemispheres.
Tips for observing in different locations
Choose twilight times to minimize urban light pollution. Aplicativos of astronomy map positions in real time, adjusting for local time zones.
- Wear comfortable clothing and avoid artificial lights after eye adaptation.
- Record events with long exposure cameras for detailed captures.
- Consult weather forecasts for clear nights, essential in December.
Basic equipment includes binoculars for conjunctions, while telescopes reveal planetary textures. Comunidades local astronomical agencies offer free guides.
Observation promotes understanding of orbital cycles, accessible to all audiences.
