The second new moon of September will occur on Friday night
A rare celestial event is set to take place the final day of September. On Friday, the second new moon of the month will shine at the night skies and a new moon which appears twice in a single month is called Black Moon. This lunar event is so rare that it has not occurred since March of 2014 and won’t happen again in Western Hemisphere until July 2019.
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The September's second new moon or Black Moon will rise on Friday, September 30, around 8:00 p.m. Eastern time but unfortunately it will be more or less invisible. When the moon is new, its illuminated side gets away from the Earth and it appears to be cloaked in darkness. So, nightwatchers won’t be able to see a dark moon placed in a dark sky.
Surprisingly, this Black Moon will be just for the Western Hemisphere’s residents. For people living in Eastern Hemisphere, it will be another ordinary moon as it will occur the next night or October 1. So, for this part of the world, this will not be the second new moon of the single month. But Eastern Hemisphere residents can also enjoy the unusual sighting of Black Moon next month as the month of October will be marked the two new moons in the region.
The Black Moon occurs about over every two and a half years but it is not the only moon defined as Black Moon. Many other lunar events are also considered Black Moon such as third new moon in the season of 4 new moons, a single month without a new moon and a single month without a full moon.
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The opposite of the Black Moon is a Blue Moon which is the second full moon in a single month and it occurs when the side of the moon facing- earth is fully illuminated by sunlight. So, the sight of the Black Moon aestically won’t be as exciting as a Blue Moon but it is also an important lunar event and will definitely had something for stargazers.