diff --git a/01_git/astime_x.c b/01_git/astime_x.c
index fbca5673f486fd9e9ab0a19aad92dbfe7596320f..93e654607f1e02cf77adf460dd580ceae7a0a015 100644
--- a/01_git/astime_x.c
+++ b/01_git/astime_x.c
@@ -121,10 +121,8 @@ void draw_sunriset(Display *dpy,
 	double start, end;
 	GC gc;
 	
-	assert(type == CIVIL_TWILIGHT 
-			|| type == NAUT_TWILIGHT 
-			|| type == ASTRO_TWILIGHT 
-			|| type == DARKNESS);
+	assert(type == CIVIL_TWILIGHT || type == NAUT_TWILIGHT 
+			|| type == ASTRO_TWILIGHT || type == DARKNESS);
 	gc = XCreateGC(dpy, win, 0, NULL);
 	XSetForeground(dpy, gc, color);
 	x = center.x - (watch_size.x * size);
@@ -132,19 +130,42 @@ void draw_sunriset(Display *dpy,
 	width = watch_size.x * size * 2;
 	height = watch_size.y * size * 2;
 	if (CIVIL_TWILIGHT == type) {
-		printf("civil\n");
-		civil_twilight(local_time->tm_year, local_time->tm_mon, 
+		int ret;
+		ret = civil_twilight(local_time->tm_year, local_time->tm_mon, 
 			local_time->tm_mday, lat, lon, &start, &end);
+		if (1 == ret) {
+			XFillArc(dpy, win, gc, x, x, width, height, 0 * 64, 359 * 64);
+			XFreeGC(dpy, gc);
+			return;
+		} else if (-1 == ret) {
+			XFreeGC(dpy, gc);
+			return;
+		}
 	} else if (NAUT_TWILIGHT == type) {
-		printf("nautical\n");
-		nautical_twilight(local_time->tm_year, local_time->tm_mon, 
+		int ret;
+		ret = nautical_twilight(local_time->tm_year, local_time->tm_mon, 
 			local_time->tm_mday, lat, lon, &start, &end);
+		if (1 == ret) {
+			XFillArc(dpy, win, gc, x, x, width, height, 0 * 64, 359 * 64);
+			XFreeGC(dpy, gc);
+			return;
+		} else if (-1 == ret) {
+			XFreeGC(dpy, gc);
+			return;
+		}
 	} else if (ASTRO_TWILIGHT == type) {
-		printf("astronomical\n");
-		astronomical_twilight(local_time->tm_year, local_time->tm_mon, 
+		int ret;
+		ret = astronomical_twilight(local_time->tm_year, local_time->tm_mon, 
 			local_time->tm_mday, lat, lon, &start, &end);
+		if (1 == ret) {
+			XFillArc(dpy, win, gc, x, x, width, height, 0 * 64, 359 * 64);
+			XFreeGC(dpy, gc);
+			return;
+		} else if (-1 == ret) {
+			XFreeGC(dpy, gc);
+			return;
+		}
 	} else if (DARKNESS == type) {
-		printf("darkness\n");
 		XFillArc(dpy, win, gc, x, x, width, height, 0 * 64, 359 * 64);
 		XFreeGC(dpy, gc);
 		return;