According to the Hanoi Astronomical Society (HAS), after saying goodbye to August with a series of special astronomical events, in September we will continue to witness many other interesting phenomena.
This September we will continue to witness another supermoon, this is the third and last supermoon of 2023. Before that, on September 23, the Earth will enter the autumnal equinox, at this point, the time of day and night is not different as in previous periods. The Northern Hemisphere is the time of the autumnal equinox, while the Southern Hemisphere is in the middle of spring.
September 15 - New Moon
The Moon will be on the same side of the Earth as the Sun and will not be visible in the night sky. This phase occurs at 08:41. This is the best time to observe faint objects such as galaxies and star clusters because they will not be affected by moonlight.
September 19 - Neptune at Opposition
The giant blue planet will be at its closest approach to Earth and will be completely illuminated by the Sun. It will be brighter than at any other time of the year and will be visible all night. This is the best time to observe and photograph Neptune. Due to its distance from Earth, without powerful telescopes it will appear as a small blue dot in the sky.
September 22 - Mercury reaches greatest western elongation
Mercury reaches its western elongation, reaching 17.9 degrees from the Sun. This is the best time to view Mercury when it is highest above the horizon in the morning. Look for the planet in the eastern sky before dawn.
September 23 - Autumnal Equinox
The Autumnal Equinox occurs at 1:43 p.m. The Sun will shine directly on the equator and day and night will be of equal length across the globe. This is also the first day of autumn in the Northern Hemisphere and the first day of spring in the Southern Hemisphere. September 29 – Full Moon, Supermoon
The Moon will be located on the opposite side of the Earth from the Sun and its face will be fully illuminated. This phase occurs at 16:59 UTC. This full moon was called the Corn Moon by early Native American tribes because corn was harvested around this time of year.
This moon is also known as the Harvest Moon. The Harvest Moon is the full moon that occurs closest to the September equinox each year. It is also the last of three supermoons in 2023. The moon will be closest to Earth and may appear slightly larger and brighter than usual.
(Source: Health and Life Newspaper)
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