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-rw-r--r--src/Panorama.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Panorama.cxx b/src/Panorama.cxx
index a072fd0..aa358ec 100644
--- a/src/Panorama.cxx
+++ b/src/Panorama.cxx
@@ -433,7 +433,7 @@ Panorama::alpha(const Hill *m) {
double
Panorama::refraction(const Hill *m) {
- double a, b, c, alpha = 6.5, T0 = 0.0;
+ double a, b, c, alpha = 6.5, T0 = 10.0;
a = 2.9e-4 * exp (-view_height / 10000.0) / (1.0 + 2.9 * T0 / 760.0);
b = 2.9 * alpha / (760.0 * (1.0 + 2.9 * T0 / 760.0));