Jupiter and Saturn are set to line up in conjunction for the first time in 800 years to create a “Christmas star”.
On December 21 the planets will stand together and appear in the form of a double planet.
The nickname The Great Conjunction, “Christmas Star” or “Star of Bethlehem”, has not been seen for 800 years.
According to Forbes, a “once-in-a-lifetime” view of this ratio will not happen again until 2020 and after 2400.
What are Christmas stars?
Jupiter and Saturn will move closer to each other and appear to be in conflict later this month.
The gas giants will be closer than ever in the Christmas night sky for centuries.
But NASA says in reality, they will actually be a few million miles away.
It is said that this combination was last seen in the 13th century and it is said that it will not happen again by 2080.
Speaking to Forbes Magazine, astronomers say such alignment observations are “rather rare.”
Patrick Hartigan, an astronomer at Rice University in Texas, said: “Polarity between these two planets is rare, occurring every 20 or so years.
“This combination is very rare because of how close the planets will be to each other.”
He added: “You have to go all the way back before the dawn of March 12, 1226, to see a closer alignment of these things visible in the night sky.”
When will it be visible?
The “Christmas Star” will be visible to Stargazers later this month on the evening of December 21st.
It is known that the Stargazers should expect that the event in the sky will present just after sunset
It can be observed from anywhere in the world where the sky is clear.
This means that those in the UK who have been looking for this incident since ..33 pm.
“Stars” will rarely appear on the horizon just after sunset, with binoculars or a telescope as needed.
Professor Hartigan noted that the pair of planets would appear less in the western sky around the sunset each evening – and should be as bright as seen in the middle of the twilight sky.
Professor Hartigan explained, “As far north as a viewer is concerned, the planets need to see a glimpse of their combination in less time before they sink below the horizon.”
“The sky in Houston is completely dark, for example, the merger will be just 9 degrees above the horizon,” he added.
“Weather helps and if you have any blocked views in the southwest it will be worth managing to see.”