SKY WATCHING FROM IBIZA

  It’s ten o’clock at night and I’m looking south.  It’s nearly completely dark and there’s no moon, which favours observation of heavenly bodies.
There’s a star that’s grabbing my attention just above Dalt Vila because it’s shining brighter than the others… or maybe it’s a planet?…  Yes, yes, of course: It’s Jupiter, the biggest planet in the Solar System which is shining with splendid white light and which with only a little more mass would have been a star.
With just a normal pair of binoculars its four biggest moons can be seen nearby.  Interestingly, it’s in the constellation of Sagittarius, one of the twelve signs of the zodiac, which is easily recognisable for its characteristic teapot shape.  This area is very dense in stars and nebulae, quite normal seeing as it is the centre of our galaxy.
Having identified Sagittarius, to its right we find Scorpio, which has the shape of an elongated letter “s” with Antares at its upper end.  Antares is a giant red star, you can’t miss it.  Libra is quite bit more difficult to distinguish and Virgo is so big that I can only recognise its main star: Spica, white and as such relatively young.

If I look straight up I can see the “Plough”, that constellation that we’ve all known since we were children and which we’ve all been able to name on clear nights since our first star-gazing experiences.  It really does look like a plough whose shape is made up of seven bright stars.  From here it’s easy to find other known constellations, as you’ll see.  Following the prolongation of the handle of the plough we find Artur, another giant red star belonging to the constellation of Bootes.  It’s very bright and is very high up in the sky.  Carrying on in the same direction we find Corona Borealis, made up of seven or eight stars with a marked shape of a tool… and thus we arrive at the zenith.
There’s a white star just above my head which also shines brightly and which is surrounded by four stars in a diamond shape:  It’s Vega and the constellation is Lira.  Very nearby there’s a group of stars which make the shape of very big cross.  This is Cygnus, it’s a swan, in which Deneb is the animal’s tail and the principal star.  Further up, looking south-eastwards we find the constellation of Aquila with Altair, a bright white star, which together with the previously mentioned Deneb and Vega makes up the summer triangle.

But… and the Polar star?  Where is it exactly?  The rule for finding it is easy:  We draw an imaginary line five times the length of the space between the two stars that make the cutting edge of the plough and we find the Polar star.  Curiously, it doesn’t move in the sky, it’s always in the same place while the other stars rotate, nor is it the brightest star in the sky as I’d previously thought.  It’s a normal, solitary star, but very important to ancient mariners who didn’t have modern sophisticated navigation systems to find their way.


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