This Sunday at 3:54 p.m. Eastern Time, Canadians under clear skies will be able to watch a thin sliver of the moon as it heads toward the western horizon, setting at just after 6 p.m.

Did I say THE moon? I meant A moon. Because the afternoon of Sept. 29 is also when Earth will briefly pick up a second moon, much smaller than our well known satellite; a so-called mini-moon or moonlet.