Back to Article List From the May 2010 issue The Sun’s disappearing act July 2010: Three planets line up in the western sky these warm summer evenings. By Martin Ratcliffe and Alister Ling | Published: May 24, 2010 | Last updated on May 18, 2023 Three planets line up in the evening sky in mid-July. Coincidentally, the Moon passes by at the same time. Astronomy: Roen Kelly Three planets line up in the western sky these warm summer evenings.