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Moon Phase on September 20, 2025: Understanding What You’ll See Tonight

by Sophie Lin - Technology Editor


Why Is the Moon Hardly Visible Tonight?

Skywatchers may have noticed the remarkably faint presence of the Moon in the night sky. The diminished visibility isn’t due to atmospheric conditions, but rather the current position of our natural satellite within its predictable lunar cycle.A complete cycle, encompassing all visible phases, takes approximately 29.5 days to complete.

Current Moon Phase: Waning Crescent

As of Saturday, September 20, 2025, the Moon is in its Waning Crescent phase. According to astronomical data, only about 2% of the Moon’s surface is currently illuminated from our perspective on Earth. This minimal illumination makes it exceedingly difficult to observe the Moon without specialized equipment.

This phase occurs after the New Moon and before the last Quarter Moon. It’s characterized by a slender sliver of light, appearing in the western sky shortly before sunrise. Did You Know? The Waning Crescent is often one of the most delicate and stunning phases of the Moon, but its subtlety makes it easily overlooked.

When to Expect the next Full Moon

For those eager to witness the Moon in its full glory,the next Full Moon is slated for October 6,2025.The previous Full Moon occurred on September 7, 2025.This recurring spectacle is a cornerstone of lunar observation and has influenced cultures for millennia.

Understanding the Eight Phases of the Moon

The changing appearance of the Moon-its phases-is a result of the varying angles at which sunlight illuminates its surface as it orbits Earth. While the Moon is always present,the amount of its visible surface changes throughout its 29.5-day cycle. Here’s a breakdown of each phase:

Phase Description
New Moon The Moon is between Earth and the sun; the side facing Earth is unlit and invisible.
Waxing Crescent A small sliver of light appears on the right side (in the Northern Hemisphere).
first Quarter Half of the Moon is illuminated on the right side.
Waxing Gibbous More than half of the Moon is lit but not yet full.
Full Moon The entire face of the Moon is illuminated.
Waning Gibbous The Moon begins to lose light on the right side.
Last Quarter Half of the Moon is illuminated on the left side.
Waning Crescent A thin sliver of light remains on the left side before becoming invisible again.

These phases aren’t just visually stunning; they’ve historically guided calendars, agriculture, and even folklore. Pro Tip: Observing the Moon’s phases can be a peaceful and rewarding hobby. Consider using a stargazing app to help you identify the current phase and upcoming lunar events.

The predictability of the Moon’s phases allows for planning observations and appreciating the subtle changes in our night sky. As we approach the next Full moon,anticipation builds for another spectacular celestial display.

What’s your favorite moon phase to observe and why? Do you use the moon phases for any particular activities or beliefs?

The study of the Moon, known as selenography, continues to reveal new insights into its composition, formation, and impact on Earth. Current missions, such as NASA’s artemis program, aim to return humans to the Moon and establish a long-term presence, furthering our understanding of this celestial neighbor.

Frequently Asked Questions About Moon Phases

  • What causes the phases of the Moon? The phases of the Moon are caused by the changing angles at which we view the Moon’s illuminated surface as it orbits Earth.
  • How long dose a full lunar cycle take? A full lunar cycle, from New Moon to New Moon, takes approximately 29.5 days.
  • Why can’t we see the dark side of the Moon? We always see the same side of the Moon because its rotation is synchronized with its orbit around Earth.
  • What is a ‘Blue Moon’? A ‘Blue moon’ refers to either the second full moon in a calendar month or, less commonly, the third of four full moons in a season.
  • Is the Moon’s phase relevant to tides? Yes, the Moon’s phase significantly impacts tides. New and Full Moons create higher tides (spring tides).
  • What is a Supermoon? A ‘Supermoon’ occurs when a full moon coincides with the Moon’s closest approach to Earth in its orbit, making it appear larger and brighter.

Share this article with fellow skywatchers and let us know what you think in the comments below!


What causes the illuminated portion of the Moon to decrease during the Waning Crescent phase?

Moon Phase on September 20, 2025: Understanding What You’ll See Tonight

Current Moon Phase – September 20, 2025

On September 20, 2025, the Moon will be in the waning Crescent phase.This means approximately 38% of the Moon’s visible surface will be illuminated. It’s a beautiful, delicate phase, often best viewed shortly before sunrise. The percentage illuminated will shift slightly depending on your precise location and time of observation. Expect to see a slender crescent shape, with the rest of the lunar disk softly glowing due to earthshine – sunlight reflected off the Earth onto the Moon.

key Details for Tonight’s Moon

* Date: September 20, 2025

* Phase: Waning Crescent

* Illumination: 38%

* Moonrise: (varies by location – check a local moonrise calculator, see resources below)

* Moonset: (Varies by location – check a local moonrise calculator)

* Next Phase: New Moon – September 27, 2025

understanding the Waning Crescent Phase

The Waning Crescent is the final phase before the New Moon. “Waning” means the illuminated portion of the Moon is decreasing each night. This phase occurs after the Last Quarter Moon and before the New Moon. It’s a time of release and letting go, often associated with introspection and quiet contemplation in various spiritual traditions.

Visibility & Best Viewing Times

Because the Waning Crescent Moon rises shortly before sunrise, it’s best observed in the pre-dawn hours.

Here’s what to expect:

  1. Look East: Scan the eastern horizon shortly before sunrise. The Moon will appear low in the sky.
  2. Clear Skies: Optimal viewing requires clear skies with minimal light pollution.
  3. Binoculars/Telescope (Optional): While visible to the naked eye, binoculars or a small telescope can enhance the view, revealing subtle details on the lunar surface, like craters and maria (dark volcanic plains).
  4. Earthshine: Pay attention to the faint glow on the unlit portion of the Moon. This is earthshine, and it’s a beautiful phenomenon.

Moonrise and Moonset Times – A Location-Specific Guide

Moonrise and moonset times vary considerably based on your geographical location.Here are some resources to find accurate times for your area:

* Time and Date.com: https://www.timeanddate.com/moon/

* US Naval Observatory: https://aa.usno.navy.mil/data/Moon

* Stellarium (free Planetarium Software): https://stellarium.org/ – Allows you to simulate the night sky from any location.

The Significance of Moon Phases – Beyond Aesthetics

Throughout history, moon phases have held cultural and practical significance.

* Agriculture: Farmers have traditionally used lunar cycles to guide planting and harvesting. While the scientific basis is debated, many still follow these practices.

* Tides: The Moon’s gravitational pull is the primary driver of ocean tides.The phase of the Moon influences tidal ranges. New and Full moons result in higher high tides (spring tides), while Quarter Moons produce lower high tides (neap tides).

* Biological Rhythms: Some studies suggest that lunar cycles may influence animal behavior and even human sleep patterns, though more research is needed.

* Cultural Traditions: Many cultures have myths, folklore, and festivals associated with different moon phases.

Observing the Moon: Tips for Beginners

* Dark Adaptation: Allow your eyes to adjust to the darkness for at least 20-30 minutes for optimal viewing. Avoid looking at shining lights.

* Red Light: Use a red flashlight to preserve your night vision.Red light has less impact on your pupils than white light.

* Lunar Maps: Download a lunar map or app to help you identify craters, maria, and other features.

* Patience: Moon observing requires patience. Take your time and enjoy the beauty of the night sky.

Moon and Space Exploration – A brief History

The Moon

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