A black moon is simply the second new moon in the space of a calendar month - the first lunar phase when the moon's shadowed side is pointing towards us.
You won't want to miss it - as the last black moon was back in April 2022, while the next one after tonight won't be until August 2027.
A black moon is just a second new moon that happens in one calendar month. If a new moon happens near the beginning of a calendar month, then the next one will happen before it's over.
Because the lunar cycle (29.5 days) is shorter than months of the year, sometimes there are two new moons in a month rather than just one.
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