From b58f0391c3ba66202ca518c323d5f4324071db52 Mon Sep 17 00:00:00 2001
From: Aymeric Galan <aymeric.galan@gmail.com>
Date: Tue, 16 Apr 2024 09:41:54 +0200
Subject: [PATCH] Fix angle offset in moments

---
 coolest/api/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/coolest/api/util.py b/coolest/api/util.py
index a54347f..2e41723 100644
--- a/coolest/api/util.py
+++ b/coolest/api/util.py
@@ -215,7 +215,7 @@ def ellipticity_from_moments(light_map, pixel_size):
     q = np.sqrt(lambda_2 / lambda_1)  # b/a, axis ratio
     phi = np.arctan(2. * mu_11_ / (mu_20_ - mu_02_)) / 2.  # position angle
     if mu_02_ > mu_20_:
-        phi += np.pi  # makes it consistent angles conventions in COOLEST
+        phi += np.pi / 2.  # makes it consistent angles conventions in COOLEST
     return phi, q