And this is because Ptolemy’s catalog in which he ranked stars by their apparent brightness on a scale of one to six, one being the brightest. Ptolemy’s scale was (much later) retrofitted to a log scale (base 100^(1/5) or about 2.512), allowing extrapolation to both brighter and dimmer objects. The brightest of Ptolemy’s first-magnitude stars actually have negative magnitudes by the modern definition.