153 IF Z$ = "END" THEN 720 ELSE IF Z$ = "NLAT" THEN 190 ELSE IF Z$ = "WLON" THEN 200 ELSE IF Z$ = "ZONE" THEN 210 ELSE IF Z$ = "MONTH" THEN 280 ELSE IF Z$ = "DAY" THEN 300 ELSE IF Z$ = "PRTMO" THEN 730
160 IF Z$ = "CALC" THEN GOSUB 310 : GOTO 140 ELSE IF Z$ = "LOC" THEN 180
170 SOUND 350,8 :GOTO 140
180 LINE INPUT "LOCATION (CITY,STATE)" ,LC$ :GOSUB 640 :GOTO 140
190 INPUT "NORTH LATITUDE (DEG,MIN)"; D1,M1 :GOSUB 640 :GOTO 140