From 3647405bcab1b12b1ad699e7a9970a4d3103680d Mon Sep 17 00:00:00 2001
From: Daniel Warner <contact@danrw.com>
Date: Wed, 30 Mar 2011 15:35:38 +0100
Subject: [PATCH] Added possible fix from dundee code

---
 SGDP4.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/SGDP4.cpp b/SGDP4.cpp
index 78b3824..9ff61d2 100644
--- a/SGDP4.cpp
+++ b/SGDP4.cpp
@@ -287,6 +287,15 @@ void SGDP4::FindPositionSDP4(double tsince) {
 
     DeepPeriodics(tsince, e, xinc, omgadf, xnode, xmam);
 
+    /*
+     * TODO: is this needed
+     */
+    if (xinc < 0.0) {
+        xinc = -xinc;
+        xnode += Globals::PI();
+        omgadf -= Globals::PI();
+    }
+
     xl = xmam + omgadf + xnode;
     xincl = xinc;
     omega = omgadf;