Astronomical Calendar September 2021 - All Events and Phenomena!

Dorian 12 min read

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Astronomical Calendar September 2021 | Meet the Astronomical Events of September 2021
Lunar Calendar for September 2021 | Will there be a Meteor Shower in September 2021? | What are the Lunar Conjunctions for September 2021? | How many eclipses will there be in 2021?
All the Astronomical Phenomena of 2021 here, in Dorian’s Secrets: The Eternal Youth Magazine.

Dorian, September 1, 2021
Images Credits: Lucas Pezeta
Definition source: Wiki
Prediction: Dorian

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Astronomical Calendar September 2021

September 3:

Conjunction of the Moon with Pollux and Castor stars, will be visible before sunrise in a Northeast direction. Maximum approach between the Moon and Castor at 23:00 UTC (day 2); between the Moon and Pollux at 05:00 UTC (day 3). Magnitudes: Pollux +1.2; Castor +1.6.

September 5:

Maximum approximation between Venus and the Spica star, visible at dusk in a western direction. 1.6 ° distance. Magnitudes: Venus -4.1; Spica +1.0.

September 7:

New Moon at 00:51 UTC.

September 9:

Conjunction of the Moon with Venus and the star Spica, visible at dusk in a western direction. Maximum approach between the Moon and Spica at 22:00 UTC; between the Moon and Venus at 06:00 UTC (day 10).

September 10:

Asteroid Pallas will be placed in opposition to the Sun at 17:00 UTC. Magnitude of +8.6. Visible through binoculars or telescope.

September 11:

Moon in Perigee (closest point to Earth) at 09:53 UTC. Distance of 368,461 kilometers; 32.4 ‘angular size.

September 12:

Conjunction of the Moon and the star Antares, visible at dusk in a Southwest direction. Maximum approach at 03:00 UTC (day 13). Antares magnitude of +1.1.

September 13:

Moon in waxing quarter phase at 20:40 UTC.

September 14:

Mercury will reach its maximum East Elongation at 04:00 UTC. Magnitude of +0.2.

September 14:

Neptune will be placed in opposition to the Sun at 09:00 UTC. It will be the best time in 2021 to observe the planet Neptune. Magnitude of +7.8. Visible only through binoculars or telescope.

September 16:

Conjunction of the Moon and Saturn at dusk in a southerly direction. Maximum approach at 05:00 UTC (day 17). Magnitude of Saturn of +0.4.

September 17:

Conjunction of the Moon and Jupiter at dusk in a southerly direction. Maximum approach at 10:00 UTC (day 18). Jupiter’s magnitude of -2.8.

September 20:

Full Moon at 23:54 UTC.

September 22:

September Equinox 2021 at 19:22 UTC. The moment when the Sun reaches the point, along the ecliptic, where it crosses into the southern heavenly hemisphere, marking the Beginning of Autumn in the Northern Hemisphere and Spring in the Southern Hemisphere.

September 25:

Conjunction of the Moon and the Open Cluster of the Pleiades, visible during the last minutes of the night of the 25th, in an easterly direction, and also throughout the early morning of the 26th.

September 26:

Conjunction of the Moon and the star Aldebaran, visible during the last minutes of the night on the 26th, in an easterly direction, and throughout the early morning of the 27th. Maximum approach at 21:00 UTC. Aldebaran magnitude of +1.0.

September 26:

The Moon at Apogee (furthest point from Earth) at 02:00 UTC. Distance of 404,100 kilometers; 29.6 ‘angular size.

September 29:

Moon in Last Quarter phase at 01:57 UTC.

September 30:

Conjunction of the Moon and the stars Castor and Pollux, visible throughout the early morning of the 30th. Maximum approximation between the Moon and Castor at 08:00 UTC; between the Moon and Pollux at 13:00 UTC. Magnitudes: Castor +1.6; Pollux +1.2.

Astronomical Calendar September 2021

Definition of UTC (Coordinated Universal Time):

Coordinated Universal Time or UTC (an intermediate between the English version Coordinated Universal Time CUT and the French version Temps universel coordonné TUC) is the main time standard by which the world regulates clocks and time.

It is one of several closely related successors to Greenwich Mean Time (GMT). For most common purposes, UTC is synonymous with GMT, as GMT is no longer the defined standard for the scientific community.

Definition of Conjunction in Astronomy:

Two stars are in conjunction when observed from a third (generally the Earth) are at the same celestial longitude. As the celestial latitude may be different, the stars are very close in the sky, although they do not coincide, passing one above the other. The conjunction is one of the main aspects of the planets. It is also applicable to any celestial object that is visually located next to another.

Definition of Perigee in Astronomy:

It is called perigee (from the Greek adjective περίγειος) to the point of the elliptical orbit that a natural or artificial body travels around the Earth, in which said body is closer to its center. In perigee the orbital speed is the maximum of the entire orbit.

Definition of Apogee in Astronomy:

Apogee (from the Greek ἀπό ‘apart, away from’ and γεω- ‘terrestrial, relative to planet Earth’) is the point in an elliptical orbit around the Earth at which a body is farthest from the center of the Earth. The opposite orbital point, the closest one, is called perigee.

Definition of Equinox:

The equinoxes (from the Latin aequinoctium (aequus nocte), “equal night”) are the times of the year when the Sun is located in the plane of the celestial equator. On that day and for an observer on the Earth’s equator, the Sun reaches its zenith (the highest point in the sky in relation to the observer, which is just above his head, that is, at 90 °). The declination parallel of the Sun and the celestial equator then coincide.

It occurs twice a year: between March 19 and 21 and between September 21 and 24 of each year.

As its name indicates, on the dates when the equinoxes occur, the day lasts approximately equal to that of the night at the equator and in the latitudes close to it.

The equinoxes are used to set the onset of spring and fall in each earth’s hemisphere.

What is a Meteor Shower?

A meteor shower is a celestial event in which the irradiation of various meteors is observed from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids that enter Earth’s atmosphere at extremely high speeds in parallel paths. Most meteors are smaller than a grain of sand, so almost all of them disintegrate and never reach the Earth’s surface. Very intense or unusual meteor showers are known as meteor bursts and meteor storms, which produce at least 1,000 meteors per hour, mostly from the Leonids. The Meteor Data Center lists more than 900 possible meteor showers, of which about 100 are well established. Several organizations point to Internet viewing opportunities. NASA maintains a daily map of active meteor showers.

What are the Moon Phases?

The lunar phases (also phases of the Moon) are the apparent changes of the visible illuminated portion of the satellite, due to its change in position with respect to the Earth and the Sun. The complete cycle, called lunation, is 29.53 days, during which the moon passes the new moon, its visible illuminated portion gradually increases again, and two weeks later, the full moon occurs and, around the following two weeks, it decreases again and the satellite enters the new phase again .

Finally, a perfect alignment between the Sun, the Earth and the Moon occurs, which results in eclipses. A solar eclipse occurs when the Moon passes in front of the solar disk, and can only occur on a new Moon, while a lunar eclipse occurs when the Moon passes through the Earth’s shadow, which can only occur on a full Moon. This transition between phases has been used to measure time, which is why many lunar calendars were created based on the lunar cycle (moon phase). The Moon actually takes eighteen days and it happens because the Sun and the Earth align with each other, having said that the Moon is forming.