A number of bright planets herald the arrival of summer. Mercury, always a difficult planet to spot, even if you know where it will be in the sky, makes a favourable showing this month, particularly during the second half of June. Start looking for it this evening, just above the WNW horizon about 30 minutes after the sun sets. It will be at its highest point in the twilight sky between June 20 and June 26, when it will be about a hand's width (at arm's length) above the horizon. You'll only have a brief window to catch a glimpse of Mercury though, as it drops below the horizon about an hour later. On June 21, look for the thin crescent of the waning moon to the lower left of Mercury. Read more
Planet Venus is set to move across the face of the Sun as viewed from Earth. The more than six-and-a-half-hour transit, which starts just after 22:00 GMT (23:00 BST) on Tuesday is a very rare astronomical phenomenon that will not be witnessed again until 2117. Read more
Ed ~ The transit of Venus begins at 22:02:25 UT, 5th June, 2012.
What a load of syzygies! Lunar eclipse Monday and Venus Transit on Tuesday (for those in the U.S.). But with the summer constellations making their way westward, there are some easy - and hard - to find objects in Sagittarius, including some star clusters, but more notably, the dwarf planet Pluto. Will you be able to spot this 14th magnitude speck during June? You'll likely need dark skies and a scope of 8 inches or larger, but give it a try anyway.