From fae845ee49a63fd7bc574310cc2a102d38024882 Mon Sep 17 00:00:00 2001
From: cinnaboot <cinnaboot@protonmail.com>
Date: Thu, 31 Mar 2022 12:24:26 -0400
Subject: [PATCH] allow negative time_step / reverse orbit propagation

---
 src/orbits.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/orbits.cpp b/src/orbits.cpp
index 9bece20..daf2ba1 100644
--- a/src/orbits.cpp
+++ b/src/orbits.cpp
@@ -238,7 +238,7 @@ getPropagatedTrueAnomaly(system_2body sys,
 	double initial_anom)
 {
 	// NOTE: 'pause' simulation when time_step is set close to 0
-	if (sys.time_step < 1e-8)
+	if (sys.time_step < 1e-8 && sys.time_step > -1e-8)
 		return initial_anom;
 
 	double ecc_anom = getPropagatedEccAnomaly(sys, initial_anom);