September is a special month for observing the sky. It then reaches the last summer full moon of the year. It is also the time of the fall equinox and the new season begins.
For a large part of August, we were able to observe the perfectly visible planets Jupiter and Saturn. Although we also have the opportunity to admire them in September, the ninth month of the year will also bring us other interesting phenomena.
Here are some astronomical events worth seeing.
Search for the Andromeda Galaxy
The first nights in September are a good time to find the Andromeda Galaxy. It is the largest galaxy in our neighborhood, and is located approximately 2.5 million light-years from Earth. It has more than twice as many stars as our Milky Way. Despite its size, it can sometimes be difficult to see with the naked eye, so we recommend that you use a telescope. It will definitely be worth it – after all, it’s as many as a trillion stars at one point in the sky.
The easiest way to find the Andromeda Galaxy is to use another, brighter object – a star or a constellation. In this case, the constellation Cassiopeia will work. At the top of the constellation, you can see a W-shaped formation that forms an arrow pointing directly at the Andromeda Galaxy. Cassiopeia can be seen after sunset, in the northeast. She is visible all night long. Andromeda will look more like a glow than a point of light. As it can be difficult to spot, it is best to look for it during the new moon. Then the sky will not be bright enough to make observation difficult. To prepare for the search even better, it is worth going to a darkened place, away from the city light.
Full Moon in September 2021
The last summer full moon will take place on the night of September 20-21. On Tuesday, at 01:54, we will see 100 percent of our natural satellite’s disk in the sky.
The September Full Moon is called the Corn Moon, the Barley Moon, and is also sometimes called the Harvest or Harvest Full. Where do these terms come from? Ancient cultures around the world have named each full moon based on plant vegetation, animal behavior, or weather. September’s full moon brings a very bright moon, which in the past allowed farmers to continue harvesting their crops even at night.
The autumn equinox
September also brings us a change of seasons. On the first day of September, as every year, we have already started the weather autumn.
The astronomical fall will begin in the northern hemisphere on September 22 at about 9:20 p.m. (Polish time). Spring will begin in the southern hemisphere. Then the Sun will pass through the point of Libra, and its rays will fall perpendicular to the surface of the Earth. Then we will be able to talk about the so-called fall equinox, and the day and night will last about the same amount of time.
We will start the calendar autumn on the next day – September 23.
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