Calendar Categories Astronomy Lunar Meteor Shower Solar System Terrestrial Agenda Agenda Day Month Week August – October 2019 Aug – Oct 2019 Collapse All Expand All Aug 24 Sat Venus @ conj w/Mars (PM) Tickets Aug 24 @ 19:18 – 19:18 Sun sets : 1918 Mars sets : 1929 Venus sets : 1931 Sep 10 Tue Neptune @ opposition Tickets Sep 10 @ 02:00 – 02:00 Sep 23 Mon Autumnal Equinox Tickets Sep 23 @ 02:50 – 02:50 Oct 5 Sat Int’l Observe the Moon Night Tickets Oct 5 all-day National Astronomy Day (Fall) Tickets Oct 5 all-day August – October 2019 Aug – Oct 2019