This page allows you to compute sight reductions. As an example try entering this example from the text. L= 26.108333 S. Note that the minutes and seconds must be changed to decimal as done here. D=29.031666 N. H=44.966667 E. The result z is 70.005186639 (70° 0.3111´) and Hc = 19.994813360 (19° 59.68´). P is 60.968334 (60° 58.10´) and Z is 41.112069600 (41° 6.724´). The degrees and minutes input isn't working yet but the output is displayed in decimal and degrees and minutes.