* ACAMAR (Theta1 Eridani) is the fifth star is the constellation Eridanus - the river.  It was originally identified as the end of the river, because other stars in the constellation were not visible from northern latitudes - Achernar now marks the end of the river.   It is one of the 57 principal navigational stars.  At about 40°S declination, it is visible throughout the Southern Hemisphere.