We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What are Lunar Phases?

Mary McMahon
By
Updated May 21, 2024
Our promise to you
All The Science is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At All The Science, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Lunar phases are different stages in the cycle of the moon's orbit around the Earth. As the moon moves, people on Earth see varying levels of its illuminated surface, from a new moon, in which the moon can't be seen at all, to a full moon, in which people see the entire portion of the moon illuminated by the Sun. This cycle takes a little less than 30 days to complete, and it may be known collectively as the lunar cycle.

People have been tracking lunar phases for thousands of years. The obvious waxing and waning of the moon was clearly visible to human societies, and many cultures based their measurements of months around the moon's movements. They also associated particular phases with various events and beliefs. For example, some cultures believed that waning moons were associated with bad outcomes in new endeavors.

The lunar phases are fairly easily explained by astronomy. At any given time, fully half of the moon and half of the Earth are illuminated by sunlight. As the moon orbits around the Earth, varying levels of the illuminated area can be seen by people standing on Earth. When the moon is between the Earth and the Sun, the illuminated side faces away, creating a new moon. Full moons occur in the opposite situation, when the Earth is between the moon and the Sun.

One might expect a constantly cycle of lunar and solar eclipses which would correspond with the lunar phases, except that the orbits of the Earth and moon are angled, rather than occurring along a straight line. This means that the perfect alignment needed for an eclipse is actually fairly rare.

When the moon is growing, it is said to be “waxing,” while a “waning” moon is shrinking. In the Northern Hemisphere, the phases of the moon move from the right to the left side of the moon's surface: if only the right quarter is illuminated, the moon is waxing towards full, while a small sliver of darkness on the right side of the moon indicates that the moon is on the wane. The opposite is true in the Southern Hemisphere, and along the equator, the crescents of waning and waxing moons actually appear in a horizontal alignment.

The variation in the appearance of the lunar phases around the world is explained by the relationship between the angles of the moon, Earth, and Sun. Changes in angle will alter the way people see the moon, depending on where they are. These variations also explain why sunrise and sunset occur at different times.

All The Science is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a All The Science researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

By Melonlity — On Jan 25, 2015

@Terrificli -- Those dials are neat but they are mostly decorative these days. Think about it. There was a time when you would set one of those and it was a wonderfully useful thing. There were few other ways available to track the moon phases.

Ah, but things have changed. You can check the various lunar phases simply by logging onto the Internet or (in a lot of cases) simply checking the weather app on your phone.

Don't get me wrong. I love those lunar dials built into grandfather clocks. But technology has make them primarily nice to look at rather than actually useful.

By Terrificli — On Jan 24, 2015

My parents have a grandfather clock that has a dial that shows off the phases of the moon (that's not exactly advanced technology because we have been studying those for years). Anyway, that dial was a darn handy thing to have. Set it once and you could tell if the moon was full, waxing, waning or whatever else.

By Logicfest — On Jan 23, 2015

@Soulfox -- The way people see the moon does have to do with angles, but the "closeness" of the moon to the horizon during its various lunar phases is very important, too. If you see the moon almost directly overhead and it appears to be hanging in the middle of the sky, it will looks small. If it is low on the horizon, though, it will look absolutely huge.

Is the moon closer to the earth when it looks big and farther away when it looks small? No, but it appears to be large when it is hovering low in the horizon because you are comparing it to trees and such on the horizon. You don't have those objects to compare the moon with when it is hanging in the sky by itself, so the moon looks small.

By Soulfox — On Jan 22, 2015

So, angles have an impact on the way people see the moon during the various moon phases, huh? Is that why the moon looks absolutely huge at times and very small at others? It makes sense that the angle at which we view the moon would have an impact on how big or small it looks.

Or, could it be that the moon is closer to the earth at some times than others.

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
All The Science, in your inbox

Our latest articles, guides, and more, delivered daily.

All The Science, in your inbox

Our latest articles, guides, and more, delivered daily.