August arrives with a rare astronomical wink: the black moon will coincide on August 23, a date when the Moon will be in its new phase and therefore invisible to the naked eye. The absence of lunar brightness provides an especially dark sky, ideal for following the final stretch of the Perseids and for enjoying other nighttime observations.
It is worth clarifying this from the beginning: “black moon” is not an official term in astronomy, but a popular label used to describe unusual patterns of New MoonsIn this case, we are faced with a seasonal black moon, a consequence of the gap between the calendar and the synodic month, which lasts about 29,5 days.
What is a black moon and why does it happen?
There is talk of seasonal black moon when they are chained together in the same season of the year four New Moons instead of the usual three, and the third in that series receives that popular name. The phenomenon appears from time to time because the rhythm of the lunar cycle and that of the calendar they don't fit perfectly.
During the New Moon, the Moon is located between the Earth and the Sun, presenting its shadowy face to us. That is why it cannot be seen, unless the alignment is perfect and results in a solar eclipse, something that does not happen on this occasion.
This irregularity is repeated with an approximate cadence of 33 monthsThe last time a seasonal black moon occurred was on May 19th 2023, and the next one, of this same type, will arrive on August 20th, 2028.
Key dates of summer
In the astronomical summer of 2025, the New Moons are distributed as follows: 25 June, July 24th, August 23th, XNUMX (the seasonal black moon) and September 21That there are four within the same station is precisely what christens the third as “black moon”.
The date of August 23th, XNUMX has an added incentive: it overlaps with the last gasps of the Perseids, the most popular meteor shower of the summer, which runs until the 24th. With the sky free of moonlight, the viewing experience is more comfortable and proven.
Will it be visible? Tips for making the most of the night
The black moon does not offer a direct “show” because, in essence, it is a Invisible New MoonPrecisely for this reason, the sky is darker and allows for a better appreciation. meteors, the Milky Way, and deep-sky objects in areas without light pollution.
- Stay away from urban lights: Look for dark areas with a clear horizon.
- Get your eyes used to it: Wait a few minutes without looking at screens to gain sensitivity.
- No rush or complex equipment: : You can see much of the sky with the naked eye; binoculars are helpful.
- Check the forecast: clouds, humidity and wind affect visibility.
If the weather is good, lying down and looking at different areas of the sky is enough to hunt. Perseid light trails and detect fine details of the summer sky.
Variations of the term and its relationship to the “blue moon”
In addition to the seasonal version, there is the calendar black moon, when they coincide in the same calendar month two New Moons; in that case, the second one is the one who receives the nickname. The rare situation of a month without New Moon, which can happen in February due to its fewer days.
In parallel, the “blue moon”, which has nothing to do with color, but with the appearance of two Full Moons in the same month. Both expressions are popular conventions useful for spreading how celestial cycles fit (or not) with our calendar.
Upcoming black moons and dates to watch
The estimates handled by fans place several milestones on the horizon, always under the logic of the lunar cycles and their rhythm of 29,5 days:
- August 31th, 2027: black moon calendar.
- August 20th, 2028: black moon seasonal.
- June 30th, 2030: black moon calendar.
- June 20th, 2031: black moon seasonal.
- January 31, 2033: black moon calendar.
- February 2033: without New Moon.
- March 31th 2033: black moon calendar.
Dates may be nuanced by time zones and definitions, but serve as a guideline. reliable guide for planning observations and understand how these oddities of the lunar calendar are linked.
The August 23rd event brings together the ingredients that make it special: third New Moon of four in the season and a darker sky just as the Perseids are nearing their final hours. Although the Moon remains hidden, the practical effect is noticeable: less brightness, more contrast and better conditions to look up and enjoy the summer sky.
