Tuesday September 1st the outer planet Neptune reaches a position in its orbit around the Sun when it is on the oppisite side of the Earth from the Sun. This coincidentally is known as opposition, and it is an orbital position which only the planets further from the Sun than the Earth may reach.
At opposition the object rises and sets in a fashion similar to our Moon when it is at full phase, in that the object at opposition rises at sunset and sets at sunrise.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.