Why are there full moons?

Have you ever wondered why the moon changes its appearance every night? Some evenings, it shines bright and round in the night sky, while at other times, it appears to be just a thin crescent. These variations in shape, known as lunar phasesIn fact, they're a marvellous space ballet orchestrated by the Earth, Moon and Sun. Let's dive into the mysteries of the moon and discover why there are full moons.

A lunar cycle that gives rhythm to our calendar

The lunar cycle, also known as the lunar calendaris a system of time measurement based on the phases of the Moon. It is fundamental to understanding the appearance of full moons.

Over the course of a lunar month (about 29.5 days), the Moon passes through various phases, from new moon to full moon, passing through the quarter moons. Each phase corresponds to a precise position of the Moon in relation to the Earth and the Sun.

The new moon is the first phase of the lunar cycle. This is when the Moon is aligned between the Earth and the Sun. The illuminated side of the Moon faces the Sun, while the dark side faces the Earth. From our vantage point on Earth, the Moon is therefore invisible.

From new moon to full moon: a journey into space

After the new moon, the Moon begins to move along its orbit around the Earth. As it moves away from the new moon position, a thin portion of the Moon's illuminated face becomes visible from Earth. This is the first quarter of the Moon.

As the days go by, this portion gradually increases in size until the Moon reaches the full moonIt's about two weeks after the new moon. At full moon, the Moon and Sun are on opposite sides of the Earth. The Moon's illuminated face is fully visible from Earth. The Moon thus appears as a complete luminous disk in the night sky. This is the phase we all know as the "full moon".

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The effects of the full moon: myths and realities

Full moons have always fascinated mankind, giving rise to many myths and beliefs. Some people believe that the full moon can influence our behavior or our sleepOthers attribute phenomena such as increased childbirth or acts of madness to the full moon.

Science, however, remains skeptical. Although some studies have attempted to establish a link between the full moon and these phenomena, none have provided solid proof. However, the full moon does have an undeniable impact on tides tides. When it is full or new, the Moon, in combination with the Sun, causes stronger tides, called "spring tides".

The Moon, the Sun and eclipses

Finally, the positioning of the Moon, Earth and Sun during a full moon is also responsible for lunar eclipses. A lunar eclipse occurs when the Earth lies between the Sun and Moon, casting its shadow on the Moon.

Unlike a solar eclipse, a lunar eclipse can be seen from anywhere on Earth where the Moon is visible. The spectacle is made all the more fascinating by the fact that the Moon can take on a reddish hue, earning it the nickname "Blood Moon".

In short, the full moon is the result of a cosmic dance between the Earth, Moon and Sun. A celestial ballet that gives rhythm to our nights and continues to fuel our dreams and imagination.

The lunar calendar and human history

Since the dawn of time, human beings have turned to the sky to navigate and mark the passage of time. Visit lunar calendarwith its regular phases, has become a valuable tool for our ancestors.

Early civilizations often based their calendars on the phases of the moon. This was the case for the Mesopotamians, the Mayans, the Chinese, the Romans and many other peoples. Their lunar calendars were essential for determining the seasons, planning harvests and even predicting eclipses.

For example, the Hebrew calendar, still in use today, is a mixture of solar and lunar calendars. It uses the new moon to mark the beginning of each month, and intersperses a thirteenth month every two to three years to synchronize with the solar year.

In some cultures, each full moon of the year even has a specific name, often reflecting seasonal changes. Thus, the "Strawberry Moon" in June signals the time to harvest strawberries, while the "Harvest Moon" in September indicates harvest time.

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The tradition of naming full moons has continued to this day. In the modern lunar calendar, each full moon has a name that reflects the seasons or other natural phenomena.

Full moons and popular culture

If the full moons fascinate scientists, they have also inspired artists and nourished our popular culture. They are present in the tales and legends of all cultures, often associated with magic, metamorphosis and madness.

Full moons are found in many folk and religious traditions. In Buddhism, for example, the full moon is a time for meditation and contemplation. In Islam, the new moon marks the beginning of each month in the Muslim lunar calendar, including the month of Ramadan.

Full moons also have their place in literature, film and music. Who hasn't heard of the werewolf who transforms when the moon is full, or of the "moonlight" that has inspired so many poems and songs?

In the world of science fiction, full moons often play an important role. In the "Star Wars" saga, for example, the Ewok-populated planet Endor is actually a moon. In the "Doctor Who" series, the Moon is revealed to be a cosmic dragon egg about to hatch.


The Moon, our closest neighbor in the cosmos, continues to fascinate and inspire us. Its regular dance with the Sun creates a celestial spectacle that gives rhythm to our nights and our lives. The various lunar phases, from first quarter to full moon, have been used to measure time since ancient times.

Despite advances in science astronomyThe mystery and beauty of the Moon continue to captivate our imagination. Whether through myths and legends linked to the full moon, beliefs about its effects on our behavior, or simply contemplating its silvery light on a full-moon evening, our link with this star remains strong and alive.

Beyond its influence on tides and the triggering of eclipses, the Moon has a profound cultural and historical impact. It has inspired humankind to dream, explore and seek to understand the universe around us. Every full moon, let's take a moment to admire this celestial spectacle and appreciate the wonders of our universe.

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