Mercury tomorrow will be at the top of its best evening appearance of this year (for north-hemisphere skywatchers).
Its maximum of elongation from the Sun (just over 21 degrees) is actually reached on May 7 at 5 hours Universal Time, but in relation to our horizon it is a shade higher on the evening of the 6th – about 19 degrees, at the time and place of the picture.
Mercury’s magnitude at this time is 0.4, a bit brighter than the first-magnitude stars of this region of the sky, Aldebaran, Betelgeuse, and Capella.
After this, Mercury will both dim and fall back toward the Sun, passing in front of it on May 30. Mars, farther off, is now too low to see, continuing to fall back more slowly behind the Sun. Venus is at about the same distance from us as Mercury, but continuing to swing higher each evening as it comes nearer to us.