Updated for 9/30: Friday's sky (Sept. 30) is host to a somewhat unusual lunar event in the Western Hemisphere: a second new moon in a single month, which some people call a "Black Moon."
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While a full moon refers to the moment when the moon's Earth-facing side is fully illuminated by sunlight, a new moon refers to the moment when the moon's Earth-facing side is fully in shadow. (Unfortunately, that means the Black Moon will be more or less invisible, even if the moon is high in the sky).
The lunar calendar almost lines up with Earth's calendar year, so there is typically one full moon and one new moon each month. A second full moon in a single calendar month is sometimes called a "Blue Moon." A Black Moon is supposedly the flip side of a Blue Moon: the second new moon in a single calendar month. The next Black Moon takes place on Sept. 30 (in the Western Hemisphere).
A Black Moon (in some parts of the world)
From the Western Hemisphere, the new moon occurring on Friday, Sept. 30, is a Black Moon. Officially, it occurs at 8:11 p.m. Eastern Time (5:11 p.m. Pacific Time).
For the Eastern Hemisphere (Europe, Africa, Asia, Australia), this new moon occurs after midnight on the calendar date of Oct. 1. So for this part of the world, this particular new moon is not the second one in the calendar month, but rather, the first! So it does not qualify as a Black Moon, and that hemisphere will have to wait until the end of the month for theirs. Indeed, for the billions living in the Eastern Hemisphere, the Black Moon will arrive on Oct. 30 or, if you live in eastern Asia, Japan, Australia or New Zealand, not until Oct. 31 (Halloween).
The Black Moon is a somewhat unusual celestial event — they occur about once every 32 months.
Slooh Community Observatory will host a webcast Monday, Oct. 3 at 3 p.m. EDT (1900 GMT) to show live views of the young moon, viewable on their website and also on Space.com. The webcast will feature discussion with special guests including Slooh's spiritual correspondent Helen Avery, who will discuss the Black Moon's significance to pagan religion, and there will also be a discussion of how to define the Black Moon when dealing with multiple time zones.
Seeing (or not seeing) a Black Moon
At its "new moon" phase, the moon is always black. It happens at that time of the month when the moon passes through the same part of the sky as the sun and as such, the moon's dark or unilluminated side faces Earth. So there really is nothing to see.
Actually, that's not always true, since there are times when the new moon passes directly between Earth and the sun and Earthlings can then see the moon's black silhouette crossing in front of the sun, causing a solar eclipse. That, in fact, actually happened with this month's first new moon, on Sept. 1, creating an annular eclipse (also known as a "Ring of Fire Eclipse") over parts of Africa.
Wait for the crescent
If you have ever wondered where the term "new moon" originated, it simply refers to the start of a new lunar cycle. The time frame from one new moon to the next is called a synodic month, which, on average, lasts 29.53 days. This is the period of the moon's phases, because the moon's appearance depends on the position of the moon with respect to the sun as seen from the Earth. The word "synodic" is derived from the Greek word sunodikos, which means "meeting," for at new moon, the moon "meets" the sun.
But unlike a "supernoon" which gets countless numbers of people scurrying for vantage points to see a slightly larger and slightly brighter-than-average full moon, with a Black Moon, you simply can't see it. In my opinion, this is the chief reason why Black Moon is going to have a tough time in becoming a popular media brand.
A couple of evenings later, however, on Oct. 2, you'll be able to pick out a slender sliver of a waxing crescent moon low in the western twilight sky about 30 or 40 minutes after sunset local time. That will also mark the start of Rosh Hashanah, the Jewish New Year 5777. And the following day (Oct. 3) is the Islamic New Year 1438, on the first day of Muharram, the first month in the lunar Islamic calendar.
Some people mistakenly refer to the appearance of any thin lunar crescent as the "new moon." This fallacy has even spread into popular literature. In his classic work "A Night to Remember," about the sinking of the Titanic, author Walter Lord quotes a fireman in a lifeboat who caught sight of a narrow crescent low in the dawn sky and exclaimed, "A new moon!"