From 58f3985567a8df801a04a757e0466f8c74f43061 Mon Sep 17 00:00:00 2001
From: ehofman <ehofman>
Date: Mon, 6 Apr 2009 19:24:29 +0000
Subject: [PATCH] Fix a NaN at higher altitudes: sin_beta could become greater
 than 1.0 which is hard to understand for asin.

---
 simgear/scene/sky/oursun.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/simgear/scene/sky/oursun.cxx b/simgear/scene/sky/oursun.cxx
index 4ace0529..67bbc723 100644
--- a/simgear/scene/sky/oursun.cxx
+++ b/simgear/scene/sky/oursun.cxx
@@ -396,6 +396,7 @@ bool SGSun::reposition( double rightAscension, double declination,
 
          double gamma =  SG_PI - sun_angle;
          double sin_beta =  ( position_radius * sin ( gamma )  ) / r_tropo;
+         if (sin_beta > 1.0) sin_beta = 1.0;
          double alpha =  SG_PI - gamma - asin( sin_beta );
 
          // OK, now let's calculate the distance the light travels
-- 
2.39.5