Courtesy of EarthSky
A Clear Voice for Science
There is one surefire way to know if the Southern Cross is visible in your sky or not. When the M or W-shaped constellation Cassiopeia the Queen is out in the sky, the Southern Cross is below the horizon. Although Cassiopeia lights up Hawaiian skies on winter nights, it sets beneath Hawaii’s northern horizon several hours before sunrise. As Cassiopeia sets, the Southern Cross rises. For all but the southernmost parts of the United States, Cassiopeia never sets. Therefore, the Southern Cross never rises.
This US Naval Observatory page tells you the rise/set times for the stars Mimosa, Hadar and Rigel Kentaurus.
Written by earthsky