La Shape and phases of the Moon today They not only determine how much we see their illuminated disk in the sky, but they also mark the rhythms of many natural and cultural phenomena: from the tides to traditional calendars, astronomical observation, and even folk customs related to hair and plants. If you look up today, you'll see a Moon with approximately 83% of its visible surface illuminated and in the waning phase, within the stage known as Waning Gibbous Moon.
During today's day and night, the Moon is in an advanced phase of its cycle: almost 19 days since the last New Moonand there are about 4 days left to reach the Fourth WaningWhen only half of the disk will be illuminated (50%), the illuminated portion gradually decreases each night, and the moonrise is progressively delayed, becoming visible mainly in the late evening and early morning, especially towards the western horizon.
What phase is the Moon in today and how does it look in the sky?
Today the Moon is in a Waning Gibbous phaseAlso called the Waning Gibbous phase, this phase appears just after the Full Moon and lasts for approximately one week. During this stage, more than half of the illuminated disk is still visible, but the fraction of light that reaches us is reduced. It decreases day by day. on the way to the Waning Quarter. Approximately, today the illumination is around 82-83% visibility, a value that can vary by up to 10% from one day to the next.
In terms of lunar age, we are around the 18,8-19 day cycle from the last New Moon. The complete cycle, known as a synodic month, lasts about 29,5 daysDuring this time, the Moon completes one orbit around the Earth, passing through its eight recognized phases. Today we are in the waning phase of the cycle, where the illumination slowly decreases.
In places like Barcelona, SpainThe phase can be described as a waning third octant, with illumination close to 81-82% and a lunar age close to 19 days, with the Moon located in constellations of the sky such as ScorpioDepending on the exact moment of observation, this aligns with the global Waning Gibbous phase, but with nuances related to time zone and the observer's position on Earth.
Regarding the approximate times, during the Waning Gibbous Moon It usually comes out between sunset and midnightIt reaches its highest point in the sky in the early morning and sets between dawn and noon. Each night it rises somewhat later and remains visible for part of the morning, so it is not uncommon to see it low in the western sky after sunrise.
If we consult a detailed lunar calendar For this period, we observed that There are about 4 days left until the Waning Quarter and about 25 days until the next Full Moon. Throughout this interval, the illumination will continue to decrease, passing through the Last Quarter and the final Waning Moon phase before returning to the New Moon, at which point the cycle restarts.
The 8 phases of the Moon and their order in the cycle
The Moon doesn't actually change shape; what varies is the amount of its illuminated face that we see from EarthThroughout its orbit, eight classic phases can be distinguished. Four are considered main because they mark very specific moments in the cycle, and four others are intermediate and last for several days.
The four main phases The phases of the Moon are: New Moon, First Quarter, Full Moon, and Last Quarter. Each corresponds to a precise moment when the relative position between the Earth, the Moon, and the Sun adopts a specific angle (0°, 90°, 180°, and 270° respectively). From Earth's surface, they may appear to last one or two days, but in reality, they are practically instantaneous.
These main phases include the four minor phasesThe intermediate phases are: Waxing Crescent (or simply Waxing Crescent), Waxing Gibbous, Waning Gibbous, and Waning Crescent (often called just Waning Crescent). These intermediate phases last approximately 7,4 days eachDuring these phases, the Moon's appearance changes gradually and continuously. To delve deeper into the eight phases and their practical uses There are guides and calendars that explain each stage in detail.
The set of eight phases, in order, is as follows: New Moon → Waxing Crescent → First Quarter → Waxing Gibbous → Full Moon → Waning Gibbous → Last Quarter → Waning MoonWhen the final stage of the Waning Moon ends, the cycle returns to the New Moon and repeats. This pattern has served for millennia to measure time and organize agricultural, ritual, and social calendars.
Each of these phases not only changes the amount of light we see in the sky, but also the moonrise and moonset timesits brightness and the way we appreciate details of its surface. For example, while the Full Moon dazzles with its maximum luminosity, the Waxing and Waning phases are preferred by telescope observers for the interplay of light and shadow on craters and mountains.
Detailed description of each lunar phase
New Moon: In this phase, the Moon is located approximately between the Earth and the Sun. The side illuminated by the Sun is the one we don't see, so the lunar disk appears dark and invisible to the naked eye. The Moon rises with the Sun at dawn, reaches its highest point around midday, and sets around sunset. When the alignment with the Sun and Earth is perfect, a lunar eclipse occurs. solar eclipsebecause the Moon can partially or totally block sunlight.
Crescent Moon (Concave Crescent): Just after the New Moon, a small portion of the disk begins to illuminate. We see a thin arc of light, a "slice" of light at the edge of the Moon. This phase marks the beginning of the waxing period, in which the The illuminated area increases night after night.The waxing moon rises between dawn and noon, rises during the afternoon, and sets between sunset and midnight.
Crescent Quarter: This occurs when the Moon has traveled approximately one-quarter of its orbit around the Earth. From our perspective, we see half of the illuminated disk; this is why it is also often called a "Half Moon." At this time, the Moon is about 90 degrees from the Sun in the sky. It rises around midday, is high in the sky near sunset, and sets around midnight.
Waxing Gibbous Moon: After the First Quarter, more than half of the Moon's disk is illuminated by sunlight, although it is not yet fully lit. The visible portion of light continues to grow, making the Moon appear larger each night. During this phase, the Moon rises between midday and sunset, dominates the night sky for much of the night, and sets between midnight and dawn.
Full moon: This is the moment when the Earth is positioned between the Moon and the Sun, so that the entire lunar hemisphere facing us is fully illuminated. The disk appears round and bright, and the Moon rises approximately at sunset, reaches its highest point near midnight, and sets around sunrise. When the alignment is very precise, a lunar eclipsebecause the Earth casts its shadow on the Moon. Furthermore, each Full Moon has traditional names such as Flower Moon, Strawberry Moon, or Pink Moon, originating from ancient agricultural cultures that used these names to mark specific times of the year.
Waning Gibbous Moon: Just after the Full Moon, the illuminated portion of the disk begins to decrease. Although we still see more than half, it becomes a little less visible each night. During this phase, as is happening tonight, the Moon usually rises between sunset and midnight, is high in the sky during the early morning hours, and sets between sunrise and midday. It is an ideal phase for observing it in the early morning hours, when the sky is usually more stable and the atmosphere clearer.
Waning Quarter: Also called the Third Quarter, it occurs when we again see half of the illuminated disk, but on the opposite side from the First Quarter. Again, the Moon is about 90 degrees from the Sun, but now in the waning phase of its cycle. During the Last Quarter, the Moon He leaves around midnight.It reaches its highest point in the sky near dawn and sets at approximately noon.
Waning Moon (Waning crescent): This is the final phase before returning to the New Moon. Only a narrow, illuminated portion remains visible, shaped like a thin waning crescent, which continues to shrink day after day. It rises between midnight and dawn, is most visible in the morning hours, and sets between midday and sunset. Eventually, the light disappears completely from our eyes, and the cycle begins again.
Typical moonrise and moonset times according to phase
The Moon does not keep a fixed schedule like the Sun; its The departure and setting times change every day. and is closely linked to the phase it is in. The general patterns of each main phase over the horizon are summarized below:
- New Moon: It usually rises near dawn, reaches its maximum height around noon, and sets near sunset.
- Crescent moon: The sunrise takes place between dawn and midday, it rises during the afternoon and sets between sunset and midnight.
- Crescent Quarter: The disc appears above the horizon at approximately noon, is high at sunset, and disappears in the west around midnight.
- Growing gibbet: It usually rises between midday and sunset, is clearly visible during the night, and sets between midnight and dawn.
- Full moon: It emerges above the horizon around sunset, reaches its highest point around midnight, and sets near dawn.
- Waning Gibbous: It appears between sunset and midnight, crosses the highest point of the sky in the early hours of the morning, and sets between dawn and midday.
- Waning Quarter: It usually rises around midnight, reaches its peak near dawn, and sets around noon.
- Waning moon: It rises between midnight and dawn, is most visible in the morning, and sets between noon and sunset.
These times are approximate and may vary slightly depending on the latitude, longitude and time of yearbut they serve as a practical guide to know in what time of day it is most likely to find the Moon in the sky according to its current phase.
The lunar cycle, the age of the Moon, and how it is measured
El lunar cycleA lunation, also called a synodic month, is the time it takes for the Moon to go from one New Moon to the next. This period lasts approximately 29,5 daysDuring this journey, the Moon describes an orbit around the Earth and presents all the phases we have discussed, with the pattern repeating itself over and over again.
When talking about the age of the Moon This refers to the number of days since the last New Moon. On the exact day of the New Moon, the age is 0 days, while a 29-day-old Moon is just one step away from beginning a new cycle. Today, with a value close to 18-19 days oldThe Moon is at an advanced point in the cycle, after the Full Moon and within the Waning Gibbous phase.
This measure of age is very useful in practical astronomy and lunar calendars, as it allows you to know, at a glance, at what part of the cycle We meet and how long until the next key event, whether it's a Full Moon, a New Moon or a quarter moon.
Many modern calendars and apps, in addition to phase and age, display data such as exact percentage of lightingThe constellation where the Moon is located and the exact moonrise and moonset times for your location. Tools such as astronomical calculators or specialized apps rely on libraries and algorithms (for example, LUNE.js or SunCalc) and geographic databases like GeoNames to provide this data with precise hourly accuracy.
Differences in appearance between hemispheres and time zones
A very common question is whether the The lunar calendar is the same worldwideThe short answer is that, although the physical cycle is the same, the specific dates can vary by up to a day due to time zone differences. If the moon is full at midnight in one place, in another country with a significant time difference it might still be the previous or following night.
For this reason, many lunar calendars clearly indicate that they work with a reference time frame, such as UTC-0Even so, the difference is usually a matter of hours, not whole days in everyday perception, although it can change the calendar day on which a Full Moon or a New Moon is officially recorded.
The other big difference isn't so much in the day, but in the The way we see the Moon from each hemisphereDue to perspective, in the Northern Hemisphere the Waxing Crescent Moon resembles the letter "D," while in the Southern Hemisphere the same phase appears as a "C," since the illuminated portion is on the opposite side. During the Waning Crescent, the opposite occurs: from the north, the illuminated portion is seen on the left; from the south, on the right.
If we approach the equator, the sensation is even different: the Moon can appear "lying down," with the illuminated portion at the bottom (waxing) or top (waning), which differs from the typical images seen at mid-latitudes. These nuances lead many guides to explicitly indicate whether the designs are intended for the northern or southern hemisphere.
In summary, the key phase dates hardly vary between hemispheres, but the visual orientation of the lunar disk Yes, it changes significantly depending on the geometry of the observation. Keeping this in mind is important when consulting meteorological or astronomical resources from other countries.
Best time to observe the Moon and the night sky
the phase of Full moon It is undoubtedly the most spectacular phase to the naked eye: the disk is completely illuminated, appears enormous as it rises over the horizon, and sometimes takes on orange or reddish hues due to the atmosphere. However, paradoxically, it is not the ideal phase if you want to appreciate fine details of craters and mountains with a telescope or binoculars, since the sunlight falls almost directly on the lunar surface, creating hardly any shadows and reducing contrast.
The best phases to enjoy the detailed lunar relief These are the waxing and waning phases (especially around the quarters). At these times, the line separating the illuminated portion from the dark, called the terminator, casts very long shadows that highlight craters, mountain ranges, and valleys. Furthermore, since the Moon is not as bright, the sky remains relatively dark, allowing for a good number of stars to be seen.
Near to Crescent quarterThe Moon is easily observed during the afternoon and early evening, a particularly convenient time frame if you want to observe it without staying up too late. Fourth WaningIn contrast, the Moon looks especially good during the early morning hours, when the air is usually cleaner and more stable, which improves the image quality through the telescope.
To see the deep sky (nebulae, faint galaxies, faint clusters), the star moment is the New moonWhen the lunar disk is not visible and the sky is at its darkest, natural light pollution is minimal on moonless nights, allowing you to see very faint objects that would be invisible with a bright moon.
Even so, if your calendar doesn't coincide with the New Moon, you can take advantage of the waxing phase by choosing times when the Moon is below the horizon or by pointing your telescope at areas of the sky far from it. Even during the Full Moon, a simple trick to improve the visibility of other stars is hide the Moon behind a building, a tree or a mountain so that its direct light does not dazzle you.
Apps and tools to track the Moon today
Currently, in addition to the classic paper calendars, there are specialized mobile applications and websites that offer you very precise information about today's Moon: exact phase, percentage of illumination, age, rising and setting times, position in the sky or even which constellation it is in.
Some general astronomy apps allow you to open a interactive lunar calendar By clicking on the day you're interested in, you can see the detailed phase, the age of the Moon, and even a simulation of its appearance. They also often include "time machine" functions to move forward or backward in time and see how the Moon's shape will evolve in the future.
Many of these tools use astronomical algorithms like LUNE.js to accurately calculate the phases and libraries like SunCalc for sunrise and sunset times, adjusted to the user's latitude, longitude and time zoneTo geolocate your city or town, they rely on open databases such as GeoNames.
If you frequently visit these types of pages, it's very useful. save them to favorites in the browser, both on a computer and on a mobile device. That way, with a single tap you can check what phase the Moon is in today, when the next Full Moon or New Moon will be, and how the phase will appear from your specific hemisphere (north or south).
In many places you will also find additional sections such as Full Moon calendars with traditional names, sections of “Birthday Moon” (to see the lunar phase on the date you were born) or even predictions of visibility of future lunar eclipses, which are usually accompanied by infographics and extra explanations.
Moon, tides and other natural effects
One of the best-known links between the Moon and the Earth is the one that occurs with the ocean tidesAlthough the phases themselves are only a visual manifestation of the cycle, the Moon's position relative to the Sun and Earth directly influences the height of the tides. During the New Moon and Full Moon, when the Moon, Earth, and Sun are almost aligned, the gravitational pull of the Moon and the Sun combines, generating what are known as tidal waves. spring tidesHigh tides are slightly higher and low tides are slightly lower.
Conversely, during the First and Last Quarters, the Moon and the Sun are approximately 90 degrees apart as seen from Earth, so their gravitational forces partially cancel each other out. This produces what are known as... neap tideswhere the difference between high and low tide is smaller. The tidal cycle repeats in sync with the lunar cycle, although it also depends on local factors such as the shape of the coastline or the depth of the sea.
Another frequently asked question is why we only always see the same side of the MoonThe explanation lies in what is called tidal locking or synchronous rotation: the Moon takes practically the same amount of time to rotate on its own axis as it does to orbit the Earth, so it always presents the same hemisphere to us. The so-called "far side" or "shadow side" is not actually a dark side, since it receives the same amount of sunlight as the visible side, but we cannot see it directly from Earth's surface.
Many people also wonder about the phases of the Moon They affect the growth of plants or hairTraditionally, numerous agricultural and personal care calendars have been guided by lunar phases: it is claimed, for example, that cutting hair during a full moon promotes faster and more vigorous growth, or that sowing certain crops during a waxing moon is beneficial for upward-growing plants, while the waning moon is associated with root crops. However, modern scientific reviews have not found solid evidence that lunar phases directly and consistently influence these processes, beyond the demonstrated influence on the tides. Even so, Many people still follow these practices. as a way to connect with natural rhythms and organize agricultural or personal care tasks.
Some health and astrology calendars even recommend or advise against certain things. surgical operations according to the lunar phase and the zodiac sign in which the Moon is located, suggesting that procedures should preferably be performed during a waning moon and avoiding operating on organs "ruled" by the lunar sign of the day. These recommendations have more to do with traditions and symbolic beliefs than with medical evidence, but they form part of the broad cultural imagery associated with the Moon.
How to tell if the Moon is waxing or waning
A simple trick to tell if the Is the moon in its waxing or waning phase? It involves observing which side of the Moon's disk is illuminated, taking into account the hemisphere you are in. In the Northern Hemisphere, when the illuminated portion is to the right, the Moon is waxing (and its shape resembles a "D" in the crescent). Conversely, if the light is concentrated on the left side, the Moon is waning.
At the southern hemisphere The opposite occurs: if the right side appears illuminated, the phase is waning, and if the light is more visible on the left side, it is waxing. This change in orientation is what makes the shape of the Moon appear "upside down" to someone in the other hemisphere in illustrations from different countries.
In areas near the equator, the Moon can take on an even more peculiar appearance, seeming to rest on one of its edges. In these cases, the illuminated portion is usually located in the lower part of the crescent-phase disc and at the top in a waning phase, which may be surprising if you are used to observing it from higher latitudes.
Besides appearance, you can also be guided by the departure and sunset timesThe waxing moon tends to rise during the day and set at night, while the waning moon rises after midnight and sets in the early morning or midday. By combining the illuminated side and the time of day you see it, it's easy to guess which phase of the lunar cycle it's in.
Today's Moon, in its Waning Gibbous phase with its disk approximately 83% illuminated, is at an advanced point in its cycle where the light gradually recedes towards the Last Quarter and New Moon. how the eight phases are linked, how the rising and setting times change, and how it looks different depending on the hemisphere And what real or traditional effects are attributed to it in tides, agriculture or daily customs, allows you to enjoy much more what you see each night in the sky and make better use of every moment to observe both our satellite and the rest of the firmament.
