Barring the occasional eclipse or meteor shower we don’t typically spend a lot of time looking up at night, but that will change this weekend. From January 20 to February 20, Saturn, Mercury, Venus, Mars and Jupiter will appear in a line from the horizon to the moon for the first time since 1940. What does this mean? Find a spot with minimal light pollution and you should be able to see the astrological event with the naked eye (and failing that, your Instagram feed). Time to start dusting off your celestial wardrobe.