The trio will form a series of interesting configurations.
. Each of these planets appears to move against the starry background at their own speeds and along their own tracks. It is obvious that since they are constantly moving at different speeds, the positions of all five planets at any particular time are unique to that particular moment. This will be a changing celestial performance stretched out over four nights from May 21 to May 24. The best time to start looking will be when the sky has turned sufficiently dark, roughly 45 minutes after sunset.
On this night, geometricians will take a special interest in the pattern composed of Venus and the Twin Stars, for they will form a nearly perfect, albeit inverted, isosceles triangle. The vertex angle is marked by Venus. The base angles are marked by Pollux and Castor, which are 4.5 degrees apart and the congruent sides or"legs" measure roughly 8.9 degrees; the angular distances from Venus to both Pollux and Castor.
Try using this triangle as a celestial yardstick. In fact, if you draw an imaginary line about 15 degrees to the upper left of Venus, you'll come to a yellow-orange object somewhat similar in brightness to Pollux and Castor. That will be Mars. Then go 15 degrees in the opposite direction from Venus, to the lower right, and there, low above the west-northwest horizon will be the narrow waxing crescent moon; our nearest neighbor in space will become far more prominent on the nights to come.
As the sky darkens on both evenings, look to see if you can make out the beautiful effect of Earthshine. It may appear that you'll be able to faintly see the entire disk of ; along with the bright crescent, the rest of the moon may appear dimly illuminated with a sort of bluish-gray glow.
France Dernières Nouvelles, France Actualités
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