Overview
- The September full moon known as the Harvest Moon will reach peak illumination on Sept. 26 at 12:49 p.m. EDT, offering bright moonrise views near sunset in many time zones.
- Neptune reaches opposition around Sept. 25–26, which places Earth between the sun and Neptune and gives the best annual chance to spot the distant planet with binoculars or a small telescope.
- A new moon on Sept. 10–11 will produce the month’s darkest skies, making that night the best for deep‑sky targets such as the Milky Way and faint galaxies.
- Venus will dominate evening twilight and is expected to hit peak brilliancy on Sept. 18, while early‑month pairings like Venus–Spica and moon–planet close approaches offer naked‑eye sights in twilight.
- Early September brings the Aurigid and Epsilon Perseids meteor peaks on Sept. 1 and Sept. 9 with low hourly rates, the Sept. 22–23 equinox marks the start of astronomical fall, and parks, clubs and museums are scheduling public telescope nights and viewing advice for urban observers.