From 650c5f2dc7e676f6a3df89a64b0155533a7e4531 Mon Sep 17 00:00:00 2001
From: Brandon Rhodes <brandon@rhodesmill.org>
Date: Sun, 17 Jan 2021 18:57:19 -0500
Subject: [PATCH] For #510, note that hadec() ignores refraction

---
 skyfield/positionlib.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/skyfield/positionlib.py b/skyfield/positionlib.py
index aa78cfaf1..1e0e24c03 100644
--- a/skyfield/positionlib.py
+++ b/skyfield/positionlib.py
@@ -286,6 +286,9 @@ def hadec(self):
         different than the declination returned by ``radec()`` if you
         have loaded a :ref:`polar motion` file.
 
+        The coordinates are not adjusted for atmospheric refraction near
+        the horizon.
+
         """
         R = framelib.itrs.rotation_at(self.t)
         r = mxv(R, self.position.au)