20/12/2020
Return of the star that guided three wise men to Bethlehem? How you can see the first alignment Jupiter and Saturn in 800 YEARS - the phenomenon that is believed to feature in Bible... On Monday evening just after sunset on 21st December 2020.
Jupiter and Saturn are set to align over Belfast skies for the first time in 800 years in a phenomenon dubbed the 'Star of Bethlehem'.
Both gas giants, they have been gradually getting closer to one another since the start of summer And, on December 21, the planets will appear to virtually overlap in the sky in a phenomenon not seen since the Middle Ages.The conjunction will cause a beaming bright light - leading many to liken it to the Star of Bethlehem.
German astronomer, Johannes Kepler, wrote in 1614 that he believed the 'star of Bethlehem' in the Nativity story could have been a conjunction of Jupiter and Saturn.
The star guided the three wise men to meet baby Jesus.
Others have suggested that the 'three wise men' could have been following a triple conjunction of Jupiter, Saturn and Venus.
While Venus won't be visible as part of the 2020 conjunction, it will still be an impressive astronomical site, best viewed on the equator but seen worldwide.
At their closest position, Jupiter and Saturn will appear less than a full moon's width apart in an incredible occurrence not set to be repeated until 2080.
The convergence - which actually puts the planets 500million miles apart - will appear closer and closer to the horizon as it gets darker until it will disappear from view completely by around 6.20pm.
The next such conjunction of the two bodies after that will not be until sometime after the year 2400.
'On the evening of closest approach on Dec 21 they will look like a double planet, separated by only 1/5th the diameter of the full moon,' Professor Hartigan added.
'For most telescope viewers, each planet and several of their largest moons will be visible in the same field of view that evening.'