The declination of Alpha Centauri is -60.5 degrees. The latitude on the Earth for Brazil is about -15 degrees. This means that if you face North, polaris the north star will be 15 degrees below the horizon and never visible from your location, even though you will see the 'Big Dipper' rise and set each night. If you face south with, or course east to your LEFT and west to your RIGHT, you will see Alpha Centauri cross your meridian at an elevation of 45 degrees to the horizon.
In April the Southern Cross is also high in the sky and close to Centaurus, whose two brighter stars form a 'pointer' to the Southern Cross which is at a lower elevation in the sky. The pointer star farthest from the Cross is Alpha Centauri. At least this is what my handy dandy sky globe seems to show, but any southern observers reading this are welcome to tell me more about how to find Alpha Centauri with the naked eye!