diff --git a/tlecatch.cc b/tlecatch.cc
new file mode 100644
index 0000000..f4a8eee
--- /dev/null
+++ b/tlecatch.cc
@@ -0,0 +1,43 @@
+#include "SGP4.h"
+#include <string>
+#include <time.h>
+using namespace std;
+int main(int argc, char **argv)
+{
+  string line;
+  //  DateTime d(2019, 8, 31, 1, 52, 30);
+  time_t now = time(0);
+  struct tm tm;
+  gmtime_r(&now, &tm);
+    
+  for(;;) {
+    DateTime d(1900 + tm.tm_year, tm.tm_mon+1, tm.tm_mday, 04, 43, 51);
+    string name, line1, line2;
+    if(!getline(cin, name) || !getline(cin, line1) || !getline(cin, line2))
+      break;
+    name.resize(name.size()-1);
+    line1.resize(line1.size()-1);
+    line2.resize(line2.size()-1);
+    Tle tle(line1, line2);
+    /*
+    cout<<"line1: "<<line1<<endl;
+    cout<<"line2: "<<line2<<endl;
+    cout << tle.ToString() << endl;
+    */
+
+    SGP4 sgp4(tle);
+
+    for(int n = 0 ; n < 1; ++n) {
+      auto eci = sgp4.FindPosition(d);
+      cout << name <<" "<<d <<": "<<eci.Position() << " " <<eci.Velocity() << " " << eci.ToGeodetic()<<endl;
+      double theta = -eci.GetDateTime().ToGreenwichSiderealTime();
+      Vector rot = eci.Position();
+      rot.x = eci.Position().x * cos(theta) - eci.Position().y * sin(theta);
+      rot.y = eci.Position().x * sin(theta) + eci.Position().y * cos(theta);
+      cout << " " << rot<< endl;
+        
+      d = d.AddSeconds(30);
+    }
+  }
+  
+}