From 46ab4a8cd50e44bbb6c27fcefea15cb575045e57 Mon Sep 17 00:00:00 2001
From: pcain-usgs <pcain@usgs.gov>
Date: Wed, 27 May 2020 12:47:28 -0600
Subject: [PATCH] Perform meridian check

---
 geomagio/residual/Calculation.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/geomagio/residual/Calculation.py b/geomagio/residual/Calculation.py
index e5a770bf9..d615f69e1 100644
--- a/geomagio/residual/Calculation.py
+++ b/geomagio/residual/Calculation.py
@@ -152,6 +152,8 @@ def calculate_D_absolute(
     # for diagnostics
     if average_mark > 180:
         average_mark -= 90
+    if meridian > 180:
+        meridian -= 90
 
     return (
         Absolute(
@@ -165,7 +167,7 @@ def calculate_D_absolute(
         average_mark,
         south_meridian,
         mark_azimuth,
-        (meridian - average_mark),
+        (average_mark - meridian),
     )
 
 
-- 
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