Clear Skies - Venus and Jupiter

 Clear Skies - Venus and Jupiter

You have undoubtedly seen in the news that Venus and Jupiter are approaching each other in the evening sky.  They will be closest on Monday/Tuesday, and they are both a delight to see now and in the next few days.

Venus, Earth, and Jupiter – and all of the planets – orbit the Sun.  Venus is closest to the Sun so orbits faster than Earth and Jupiter, and Earth is closer than Jupiter, so Earth orbits faster than Jupiter.

What we are seeing is that Venus is “catching up” to Jupiter from our vantage point on Earth.  Because Earth is orbiting faster than Jupiter, we are leaving Jupiter behind, meaning it appears lower to the horizon each day.

It is best to see this pairing 45 to 90 minutes after sunset, where you will find them low in the west.  Venus is much brighter than Jupiter, but both are unmistakable. 

If you have binoculars, try to see the moons of Jupiter, which will appear like a little string of up to four “stars” in a line on either side of Jupiter.  They change position fairly rapidly from night to night, so it can be a pleasure to note their dance over the course of a few days.  There are four of these bright moons – the so-called Galilean moons in honour of Galileo who first saw them in a telescope, but sometimes one or more may be in front or behind Jupiter and so not seen.

At their closest, Venus and Jupiter will be one and half degrees apart – about one and half widths of your little finger held at arm’s length.  You can follow them for a few more nights as the distance between them increases.

Clear skies.

David