September 10 – Full moon
The Moon will be on the opposite side of the Earth to the Sun and it will be fully lit. This milestone occurs at 4:58 p.m. Vietnam time. Native Americans called it the Corn Moon because corn was harvested at this time of year. This moon is also called the Harvest Moon. The Harvest Moon is the full moon that occurs each year closest to the autumnal equinox.
September 16 – Neptune in opposition
The giant blue planet will be closest to Earth and will be entirely illuminated by the Sun. It will be brighter than any other time of year and will appear all night long. This is the best time to observe and photograph Neptune. Because the distance from Earth is too far, without powerful telescopes, it will just be a small blue dot in the sky.
September 23 – Autumn Equinox
The autumnal equinox occurs at 7:55 a.m. (Vietnam time). The Sun will shine directly on the equator and day and night will be of equal length on the globe. It is also the first day of fall in the northern hemisphere and the first day of spring in the southern hemisphere.
Illumination of the Earth by the Sun at the spring and autumn equinoxes
September 26 – New Moon
The Moon will be in the same direction as the Earth relative to the Sun and will not appear in the night sky. This stage takes place at 04:55 (Vietnam time). This is the best time to observe faint objects such as galaxies and star clusters, as they will not be affected by moonlight.
September 26 – Jupiter in opposition
The giant planet will be closest to Earth and will be entirely illuminated by the Sun. This time it will be brighter than any other time of year and will stay bright all night. This is the best time to observe and photograph Jupiter and its moons. A medium-sized telescope will be able to show you some details on its rings. A good pair of binoculars can show you the four largest moons, as bright spots on either side of Jupiter.
See more 2022 ephemeris here: https://deepsky2000.net/quan-sat-thien-van/lich-thien-van-nam-2022/
HAS translation team