A rare Black Moon is set to rise tonight, the final day of September - the first time one has appeared since March 2014.

Last September also saw an even rarer glimpse of a blood red supermoon, which had not been seen in our skies for 30 years.

But what exactly is a Black Moon - it certainly sounds ominous - and will we be able to see it?

What is it?

Though the name sounds ominous, according to Space.com, the term Black Moon simply refers to the rare occurrence of two new moons in a single month.

Essentially, a Black Moon is the exact opposite of a Blue Moon, the term used when you get two full moons in one month.

The new moon is the first phase in the lunar cycle and is nearly impossible to see. Space.com explains that the moon is hard to spot during the new moon phase because it's passing through the same part of the sky as the sun, and its dark side is facing us on Earth.

When is it?

The Black Moon tonight means the month will be closing with its second very dark night. In fact, the first new moon actually took place on the first of the month, which means September 2016 will be bookended by darkness.

Where can I see it?

Tonight will offer the perfect conditions for stargazing in the Western Hemisphere. The Eastern Hemisphere won't get its Black Moon until the end of October.

Black Moons don't happen every day: our next Black Moon will occur in July 2019, which make tonight's sky all the more special.

Remember to send your pictures to editor@watfordobserver.co.uk.