--- ray/src/gen/gensky.c	1991/03/19 12:09:27	1.4
+++ ray/src/gen/gensky.c	1991/08/06 08:22:06	1.5
@@ -53,7 +53,7 @@ main(argc, argv)
 int  argc;
 char  *argv[];
 {
-	extern double  atof();
+	extern double  atof(), fabs();
 	int  i;
 
 	progname = argv[0];
@@ -101,6 +101,11 @@ char  *argv[];
 			}
 		else
 			userror("bad option");
+
+	if (fabs(s_meridian-s_longitude) > 30*PI/180)
+		fprintf(stderr,
+	"%s: warning: %.1f hours btwn. standard meridian and longitude\n",
+			progname, (s_longitude-s_meridian)*12/PI);
 
 	printhead(argc, argv);