From 0909aeeddd6a7a5d28b2a7be6fa96b0977a4eaf3 Mon Sep 17 00:00:00 2001
From: Don Cross <cosinekitty@gmail.com>
Date: Thu, 4 Jul 2019 15:32:15 -0400
Subject: [PATCH] Python: small performance improvement in _iau2000b.

---
 generate/template/astronomy.py | 4 +---
 generate/template/old.py       | 4 +---
 source/python/astronomy.py     | 4 +---
 3 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/generate/template/astronomy.py b/generate/template/astronomy.py
index c98d5a2f..f36520bc 100644
--- a/generate/template/astronomy.py
+++ b/generate/template/astronomy.py
@@ -388,14 +388,12 @@ class _iau2000b:
         om  = math.fmod((450160.398036 - t * 6962890.5431),    _ASEC360) * _ASEC2RAD
         dp = 0
         de = 0
-        i = 76
-        while i >= 0:
+        for i in range(77):
             arg = math.fmod((_nals_t[i][0]*el + _nals_t[i][1]*elp + _nals_t[i][2]*f + _nals_t[i][3]*d + _nals_t[i][4]*om), _PI2)
             sarg = math.sin(arg)
             carg = math.cos(arg)
             dp += (_cls_t[i][0] + _cls_t[i][1] * t)*sarg + _cls_t[i][2]*carg
             de += (_cls_t[i][3] + _cls_t[i][4] * t)*carg + _cls_t[i][5]*sarg
-            i -= 1
         self.dpsi = -0.000135 + (dp * 1.0e-7)
         self.deps = +0.000388 + (de * 1.0e-7)
 
diff --git a/generate/template/old.py b/generate/template/old.py
index 35e80cee..39e83607 100644
--- a/generate/template/old.py
+++ b/generate/template/old.py
@@ -388,14 +388,12 @@ class _iau2000b:
         om  = math.fmod((450160.398036 - t * 6962890.5431),    _ASEC360) * _ASEC2RAD
         dp = 0
         de = 0
-        i = 76
-        while i >= 0:
+        for i in range(77):
             arg = math.fmod((_nals_t[i][0]*el + _nals_t[i][1]*elp + _nals_t[i][2]*f + _nals_t[i][3]*d + _nals_t[i][4]*om), _PI2)
             sarg = math.sin(arg)
             carg = math.cos(arg)
             dp += (_cls_t[i][0] + _cls_t[i][1] * t)*sarg + _cls_t[i][2]*carg
             de += (_cls_t[i][3] + _cls_t[i][4] * t)*carg + _cls_t[i][5]*sarg
-            i -= 1
         self.dpsi = -0.000135 + (dp * 1.0e-7)
         self.deps = +0.000388 + (de * 1.0e-7)
 
diff --git a/source/python/astronomy.py b/source/python/astronomy.py
index 08f87ef4..7668e3b0 100644
--- a/source/python/astronomy.py
+++ b/source/python/astronomy.py
@@ -479,14 +479,12 @@ class _iau2000b:
         om  = math.fmod((450160.398036 - t * 6962890.5431),    _ASEC360) * _ASEC2RAD
         dp = 0
         de = 0
-        i = 76
-        while i >= 0:
+        for i in range(77):
             arg = math.fmod((_nals_t[i][0]*el + _nals_t[i][1]*elp + _nals_t[i][2]*f + _nals_t[i][3]*d + _nals_t[i][4]*om), _PI2)
             sarg = math.sin(arg)
             carg = math.cos(arg)
             dp += (_cls_t[i][0] + _cls_t[i][1] * t)*sarg + _cls_t[i][2]*carg
             de += (_cls_t[i][3] + _cls_t[i][4] * t)*carg + _cls_t[i][5]*sarg
-            i -= 1
         self.dpsi = -0.000135 + (dp * 1.0e-7)
         self.deps = +0.000388 + (de * 1.0e-7)