For people in the UK, looking at the weather, tonight looks to be the best night to observe the #GreatConjunction. Jupiter and Saturn, both visible to the naked eye and so close together they appear as a single object (depending on eyesight!). Here is how to see it...
https://twitter.com/GP_O11/status/1340526782366306305
Time - you have a narrow window. From about 4.40 to 5.30. Too early and it isn't dark enough to see them. Too late and they will have set, just likes the Sun sets as the Earth turns. 
Direction - You need an unobscured south western horizon. The planets will be low in the sky, maybe two hand widths above the horizon. So consider going for a walk at around that time and use your phone's compass to check your direction.
What you will see - to the naked eye you will see a single bright, white and stationary starlike object. This is Jupiter. If you look really hard you may just spot a slightly fainter Saturn to its top left.
How best to see it - you will see it with the naked eye for sure, but binoculars or a small telescope will really make it pop. Like the pictures from @GP_O11 at the start of this thread.
Is it rare - yeah. The inclination and eccentricity of all of the planets mean that they very rarely all line up. The conjunction will only last a day or so. But there are many other interesting things to see in the night sky, throughout the year.
Is this astrological? No - The basic idea that the position of planets effect our lives was disproven by Isaac Newton with this formula - that shows that objects in the room around you exert stronger gravitational fields on you than the planets in the Solar System.
What does it mean? Is this the Star of Bethlehem? This is a chance alignment of planets that could occur at any time of year. So really it means whatever you want it to mean. Enjoy the cosmic spectacle and, above all, get outside and see it for yourself!
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