Following the Moon and wondering where are the fleeting inner solar system planets are this month? While Jupiter and Saturn sink into the dusk on the far side of the Sun this month, the real action transpires in the dawn sky in mid-September, with a complex set of early morning conjunctions, groupings and occultations. Mercury just passed greatest elongation 18 degrees west of the Sun on September 12 th. The conjunction occurs at UT, favoring the western Pacific region in the dawn hours. The pair is just 17 degrees from the Sun. As mentioned previously, this is the closest conjunction of two naked eye planets in , so close the two will seem to merge to the naked eye and make a nice split with binoculars.