The two planets will line up to create a bright light visible from Earth on the winter solstice.

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The celestial event is known as the Great Conjunction by astronomers and has also been nicknamed a Christmas Star or Star of Bethlehem.

Though they will look aligned, the gas giants will be hundreds of millions of miles apart.

When was the last Great Conjunction?

The orbits of the two Gas Giants and Earth means there is an alignment every 20 years, which makes Jupiter and Saturn appear closer in the night’s sky.

The last time they appeared this close was way back in the 13th Century and NASA doesn’t predict another alignment this close for another 60 years.

Patrick Hartigan, an astronomer at Rice University in America, said in an interview with Forbes that it was an “exceptionally rare” event.

And added the last time the planets were aligned this close was on 4 March 1226.

Where will I be able to see the Christmas Star?

Look south west, just after sunset, between 4:30pm and 5:30pm.

It is bright enough to be seen without the use of telescopes or binoculars, yet astronomers say several of the planets’ satellites will be visible with viewing aides.