Wednesday February 11th the innermost planet Mercury crosses the plane of the ecliptic, Earth’s orbit, moving south in what is called a descending node. The orbit of Mercury is inclined about 7o from the the ecliptic setting up both a descending node as well as an ascending node approximately one-half orbit later.
The next time Mercury is at descending node it will coincide with Mercury at inferior conjunction. This will set up a transit of the Sun by Mercury.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.