According to the agricultural book Old Farmer's Almanac, this full moon falls on December 18, known as the "Cold Moon", and if you live at the average latitude of the Northern Hemisphere, that name is no mystery. The sun at this time of year sets early and the sky gradually darkens around 5:30 p.m. The full moon will officially appear at 11 am.
The full moon of December will be the longest full moon of the year and the last full moon before the Lunar New Year in the Northern Hemisphere. The East will arrive at 10:59 p.m. on December 21, when the Arctic will be at its farthest incline - 23.5 degrees - from the Sun.
The duration of the Moon phase depends on the position of the Moon relative to the Earth; a full moon occurs when the Moon is completely opposite the Earth relative to the Sun.
That means full moon time depends on the time zone in other countries, for example in Vietnam, the full moon will be on the night of December 18, while in England, the full moon will be at 16:36 on December 19, and in Cape Town, South Africa, it will be 6:35 on the same day as December 19.
If looking southwest at around the time of the full moon on the night of December 18, the full moon will be on the left side. The three planets - sao Kim, sao Tho and sao Moc - will form an almost straight path from the Southwest to the South, rising at a 45-degree angle to the horizon, in which sao Moc is at its highest position while sao Kim is closest to the horizon.
The Kim star will be only about 10 degrees above the horizon at that time, but it will be so bright that even in relatively poor conditions - such as the city landscape with street lights - it can still be seen with the naked eye.
Saturday will be around 20 degrees high and will be on the left of sao Kim, and Moc will be around 32 degrees and on the left of sao Tho. Star Kim was the first to appear at around 6:40 p.m., followed by Star Mars at 7:50 p.m. and Star Mars at 9:20 p.m.
Meanwhile, according to Heavens- Above, Mars will appear at around 5:28 p.m.
At this time in December, the winter star clusters in the Northern Hemisphere are very prominent - star Thien Lang ("Dog Star" Sirius), the brightest star in the night sky with an apparent brightness of -1.47 above the horizon and the Eastern Star Cluster (Orion) southeast. The Greek capital faces the Taurus star cluster, and to the left of the Taurus star cluster is the Song Tu star cluster (Gemini).
From Song Tu Cluster, looking up to the North, you can see Ngu Phu Cluster (Auriga), Ngu xa (Charioteer), and Capella - the brightest star in Ngu Phu Cluster.
As night falls, other constellations become apparent, although they are difficult to see from locations in the city. For example, Cu Gio, Con Cua, located just east of Song Tu, is blurred and difficult to detect in a bright city.
