September 16: New Moon
The Moon will be directly between the Earth and the Sun and will not be visible from Earth.
September 22: September Equinox
The September equinox occurs at 14:49 UTC. The Sun will shine directly on the equator and there will be nearly equal amounts of day and night throughout the world. This is also the first day of fall (autumnal equinox) in the northern hemisphere and the first day of spring (vernal equinox) in the southern hemisphere.
September 29: Uranus at Opposition
The blue-green planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. This is the best time to view Uranus. Due to its distance, it will only appear as a tiny blue-green dot in all but the most powerful telescopes.
September 30: Full Moon
The Moon will be directly opposite the Earth from the Sun and will be fully illuminated as seen from Earth.