Rare 'black moon' coming Friday
The last day of September will feature what astronomers call a "black moon," or the second appearance of a new moon in a month, according to Accuweather.
While a new moon typically happens only once a month, on Friday, Americans will witness the month's second new moon, a lunar phenomenon that has not been seen in two years.
In general, a new moon occurs when the side of the moon that is illuminated by the sun is facing away from onlookers, making it invisible.