Calendar of astronomical events September 2021

Another year is coming to an end, the new year is approaching. Let’s find out what exciting astronomical events await us in September 2021.

This astronomical calendar document is mainly translated from the Seasky website, in addition to many reputable scientific websites such as Earthsky, NASA, Time & Date, etc. converted to Vietnamese time.

Table of Contents

The time in the article has been converted to Vietnamese time

September 7 – New Moon

The Moon and Sun will be on the same side of Earth and will not be visible in the sky. This phase of the moon occurs at 07:52. This is the best time of the month to observe faint objects such as galaxies or star clusters, as they are undisturbed by moonlight.

September 14 – Neptune is in opposition

The giant blue planet will be located very close to Earth and the entire surface of the planet will be illuminated by the Sun. This month, Neptune will be the brightest of the year and can be observed all night. This is the best time to observe and photograph this planet. Due to its extreme distance from Earth, Neptune will only appear as a small blue dot unless the most powerful telescopes are used.

Neptune is the eighth planet. Photo: Parenthood.

September 14 – Mercury reaches its maximum equinox in the East

This planet will be located at the Grand Ecliptic and 26.8 degrees from the Sun. This is the best time to view Mercury as its highest point of ascension will be just above the evening horizon. Look for this planet in the western sky just after sunset.

September 20 – Full Moon

The Moon and the Sun will be on opposite sides of the Earth, and its surface will be completely illuminated. This phase of the moon occurs at 04:54. This lunar period has also been known as the “corn moon” among Native Americans since ancient times because corn is often harvested at this time of year. Additionally, this moon phase is also known as the “harvest moon” – the full moon closest to the fall equinox of the year.

September 23 – Autumn Equinox

The autumnal equinox takes place at 12:11 a.m. The Sun will shine perpendicular to the equator, and day and night will be roughly equal around the world. It is also the first day of autumn in the northern hemisphere and of spring in the southern hemisphere.