diff --git a/generate/codegen.c b/generate/codegen.c
index 08bbd2ef..120d995c 100644
--- a/generate/codegen.c
+++ b/generate/codegen.c
@@ -495,6 +495,10 @@ static int GenArrayEnd(cg_context_t *context)
         fprintf(context->outfile, "\n}");
         return 0;
 
+    case CODEGEN_LANGUAGE_PYTHON:
+        fprintf(context->outfile, "\n]");
+        return 0;
+
     default:
         return LogError(context, "GenArrayEnd: Unknown language type %d", context->language);
     }
@@ -514,6 +518,11 @@ static int GenDeltaTArrayEntry(cg_context_t *context, int count, double mjd, con
         fprintf(context->outfile, "{ mjd:%0.1lf, dt:%s }", mjd, dt_text);
         return 0;
 
+    case CODEGEN_LANGUAGE_PYTHON:
+        fprintf(context->outfile, "%s\n", (count==1) ? "[" : ",");
+        fprintf(context->outfile, "_delta_t_entry_t(%0.1lf, %s)", mjd, dt_text);
+        return 0;
+
     default:
         return LogError(context, "GenDeltaTArrayEntry: Unknown language type %d", context->language);
     }
diff --git a/generate/codegen.h b/generate/codegen.h
index 35fbe740..34e8e9ee 100644
--- a/generate/codegen.h
+++ b/generate/codegen.h
@@ -30,7 +30,8 @@ typedef enum
 {
     CODEGEN_LANGUAGE_UNKNOWN,
     CODEGEN_LANGUAGE_JS,
-    CODEGEN_LANGUAGE_C
+    CODEGEN_LANGUAGE_C,
+    CODEGEN_LANGUAGE_PYTHON
 }
 cg_language_t;
 
diff --git a/generate/generate.c b/generate/generate.c
index f0fb2017..d44d4655 100644
--- a/generate/generate.c
+++ b/generate/generate.c
@@ -405,7 +405,8 @@ static int GenerateSource(void)
 {
     int error;
     CHECK(GenerateCode(CODEGEN_LANGUAGE_JS, "../source/js/astronomy.js", "template/astronomy.js", "output"));
-    CHECK(GenerateCode(CODEGEN_LANGUAGE_C,  "../source/c/astronomy.c",   "template/astronomy.c",  "output"));
+    CHECK(GenerateCode(CODEGEN_LANGUAGE_C, "../source/c/astronomy.c", "template/astronomy.c",  "output"));
+    CHECK(GenerateCode(CODEGEN_LANGUAGE_PYTHON, "../source/python/astronomy.py", "template/astronomy.py", "output"));
 fail:
     return error;
 }
diff --git a/generate/template/astronomy.c b/generate/template/astronomy.c
index c9681236..d5aa1c0b 100644
--- a/generate/template/astronomy.c
+++ b/generate/template/astronomy.c
@@ -317,7 +317,6 @@ static astro_search_result_t SearchError(astro_status_t status)
 
 static astro_func_result_t SynodicPeriod(astro_body_t body)
 {
-    static const double Te = 365.256;  /* Earth's orbital period in days */
     double Tp;                         /* planet's orbital period in days */
     astro_func_result_t result;
 
@@ -337,7 +336,7 @@ static astro_func_result_t SynodicPeriod(astro_body_t body)
         return FuncError(ASTRO_INVALID_BODY);
 
     result.status = ASTRO_SUCCESS;
-    result.value = fabs(Te / (Te/Tp - 1.0));
+    result.value = fabs(EARTH_ORBITAL_PERIOD / (EARTH_ORBITAL_PERIOD/Tp - 1.0));
     return result;
 }
 
diff --git a/generate/template/astronomy.py b/generate/template/astronomy.py
new file mode 100644
index 00000000..9c487f63
--- /dev/null
+++ b/generate/template/astronomy.py
@@ -0,0 +1,168 @@
+#!/usr/bin/env python3
+
+import math
+import datetime
+
+_T0 = 2451545.0
+_MJD_BASIS = 2400000.5
+_DEG2RAD = 0.017453292519943296
+_RAD2DEG = 57.295779513082321
+_ASEC360 = 1296000.0
+_ASEC2RAD = 4.848136811095359935899141e-6
+_ARC = 3600.0 * 180.0 / math.pi     # arcseconds per radian
+_C_AUDAY = 173.1446326846693        # speed of light in AU/day
+_ERAD = 6378136.6                   # mean earth radius in meters
+_AU = 1.4959787069098932e+11        # astronomical unit in meters
+_KM_PER_AU = 1.4959787069098932e+8
+_ANGVEL = 7.2921150e-5
+_SECONDS_PER_DAY = 24.0 * 3600.0
+_SOLAR_DAYS_PER_SIDEREAL_DAY = 0.9972695717592592
+_MEAN_SYNODIC_MONTH = 29.530588
+_EARTH_ORBITAL_PERIOD = 365.256
+_REFRACTION_NEAR_HORIZON = 34.0 / 60.0
+_SUN_RADIUS_AU  = 4.6505e-3
+_MOON_RADIUS_AU = 1.15717e-5
+_ASEC180 = 180.0 * 60.0 * 60.0
+
+def _LongitudeOffset(diff):
+    offset = diff
+    while offset <= -180.0:
+        offset += 360.0
+    while offset > 180.0:
+        offset -= 360.0
+    return offset
+
+def _NormalizeLongitude(lon):
+    while lon < 0.0:
+        lon += 360.0
+    while lon >= 360.0:
+        lon -= 360.0
+    return lon
+
+def VectorLength(vector):
+    return math.sqrt(vector.x**2 + vector.y**2 + vector.z**2)
+
+BODY_INVALID = -1
+BODY_MERCURY = 0
+BODY_VENUS = 1
+BODY_EARTH = 2
+BODY_MARS = 3
+BODY_JUPITER = 4
+BODY_SATURN = 5
+BODY_URANUS = 6
+BODY_NEPTUNE = 7
+BODY_PLUTO = 8
+BODY_SUN = 9
+BODY_MOON = 10
+
+BodyName = [
+    'Mercury',
+    'Venus',
+    'Earth',
+    'Mars',
+    'Jupiter',
+    'Saturn',
+    'Uranus',
+    'Neptune',
+    'Pluto',
+    'Sun',
+    'Moon',
+]
+
+def BodyCode(name):
+    return BodyName.index(name)
+
+def _IsSuperiorPlanet(body):
+    return body in [BODY_MARS, BODY_JUPITER, BODY_SATURN, BODY_URANUS, BODY_NEPTUNE, BODY_PLUTO]
+
+_PlanetOrbitalPeriod = [
+    87.969,
+    224.701,
+    _EARTH_ORBITAL_PERIOD,
+    686.980,
+    4332.589,
+    10759.22,
+    30685.4,
+    60189.0,
+    90560.0
+]
+
+class Error(Exception):
+    def __init__(self, message):
+        Exception.__init__(self, message)
+
+class EarthNotAllowedError(Error):
+    def __init__(self):
+        Error.__init__(self, 'The Earth is not allowed as the body.')
+
+class InvalidBodyError(Error):
+    def __init__(self):
+        Error.__init__(self, 'Invalid astronomical body.')
+
+class BadVectorError(Error):
+    def __init__(self):
+        Error.__init__(self, 'Vector is too small to have a direction.')
+
+def _SynodicPeriod(body):
+    if body == BODY_EARTH:
+        raise EarthNotAllowedError()
+    if body < 0 or body >= len(_PlanetOrbitalPeriod):
+        raise InvalidBodyError()
+    if body == BODY_MOON:
+        return _MEAN_SYNODIC_MONTH
+    return abs(_EARTH_ORBITAL_PERIOD / (_EARTH_ORBITAL_PERIOD/_PlanetOrbitalPeriod[body] - 1.0))
+
+def _AngleBetween(a, b):
+    r = VectorLength(a) * VectorLength(b)
+    if r < 1.0e-8:
+        return BadVectorError()
+    dot = (a.x*b.x + a.y*b.y + a.z*b.z) / r
+    if dot <= -1.0:
+        return 180.0
+    if dot >= +1.0:
+        return 0.0
+    return _RAD2DEG * math.acos(dot)
+
+class _delta_t_entry_t:
+    def __init__(self, mjd, dt):
+        self.mjd = mjd
+        self.dt = dt
+
+_DT = $ASTRO_DELTA_T()
+
+def _DeltaT(mjd):
+    if mjd <= _DT[0].mjd:
+        return _DT[0].dt
+    if mjd >= _DT[-1].mjd:
+        return _DT[-1].dt    
+    # Do a binary search to find the pair of indexes this mjd lies between.
+    lo = 0
+    hi = len(_DT) - 2   # Make sure there is always an array element after the one we are looking at.
+    while True:
+        if lo > hi:
+            # This should never happen unless there is a bug in the binary search.
+            raise Error('Could not find delta-t value.')
+        c = (lo + hi) // 2
+        if mjd < _DT[c].mjd:
+            hi = c-1
+        elif mjd > _DT[c+1].mjd:
+            lo = c+1
+        else:
+            frac = (mjd - _DT[c].mjd) / (_DT[c+1].mjd - _DT[c].mjd)
+            return _DT[c].dt + frac*(_DT[c+1].dt - _DT[c].dt)
+
+def _TerrestrialTime(ut):
+    return ut + _DeltaT(ut + Y2000_IN_MJD) / 86400.0
+
+class astro_time_t:
+    def __init__(self, ut):
+        self.ut = ut
+        self.tt = _TerrestrialTime(ut)
+
+_EPOCH = datetime.datetime(2000, 1, 1, 12)
+
+def CurrentTime():
+    now = datetime.datetime.utcnow()
+    dt = now - _EPOCH
+    ut = dt.total_seconds() / 86400.0
+    return astro_time_t(ut)
diff --git a/source/c/astronomy.c b/source/c/astronomy.c
index 4b840ff0..fe074f42 100644
--- a/source/c/astronomy.c
+++ b/source/c/astronomy.c
@@ -317,7 +317,6 @@ static astro_search_result_t SearchError(astro_status_t status)
 
 static astro_func_result_t SynodicPeriod(astro_body_t body)
 {
-    static const double Te = 365.256;  /* Earth's orbital period in days */
     double Tp;                         /* planet's orbital period in days */
     astro_func_result_t result;
 
@@ -337,7 +336,7 @@ static astro_func_result_t SynodicPeriod(astro_body_t body)
         return FuncError(ASTRO_INVALID_BODY);
 
     result.status = ASTRO_SUCCESS;
-    result.value = fabs(Te / (Te/Tp - 1.0));
+    result.value = fabs(EARTH_ORBITAL_PERIOD / (EARTH_ORBITAL_PERIOD/Tp - 1.0));
     return result;
 }
 
diff --git a/source/python/astronomy.py b/source/python/astronomy.py
new file mode 100644
index 00000000..21c6398e
--- /dev/null
+++ b/source/python/astronomy.py
@@ -0,0 +1,259 @@
+#!/usr/bin/env python3
+
+import math
+import datetime
+
+_T0 = 2451545.0
+_MJD_BASIS = 2400000.5
+_DEG2RAD = 0.017453292519943296
+_RAD2DEG = 57.295779513082321
+_ASEC360 = 1296000.0
+_ASEC2RAD = 4.848136811095359935899141e-6
+_ARC = 3600.0 * 180.0 / math.pi     # arcseconds per radian
+_C_AUDAY = 173.1446326846693        # speed of light in AU/day
+_ERAD = 6378136.6                   # mean earth radius in meters
+_AU = 1.4959787069098932e+11        # astronomical unit in meters
+_KM_PER_AU = 1.4959787069098932e+8
+_ANGVEL = 7.2921150e-5
+_SECONDS_PER_DAY = 24.0 * 3600.0
+_SOLAR_DAYS_PER_SIDEREAL_DAY = 0.9972695717592592
+_MEAN_SYNODIC_MONTH = 29.530588
+_EARTH_ORBITAL_PERIOD = 365.256
+_REFRACTION_NEAR_HORIZON = 34.0 / 60.0
+_SUN_RADIUS_AU  = 4.6505e-3
+_MOON_RADIUS_AU = 1.15717e-5
+_ASEC180 = 180.0 * 60.0 * 60.0
+
+def _LongitudeOffset(diff):
+    offset = diff
+    while offset <= -180.0:
+        offset += 360.0
+    while offset > 180.0:
+        offset -= 360.0
+    return offset
+
+def _NormalizeLongitude(lon):
+    while lon < 0.0:
+        lon += 360.0
+    while lon >= 360.0:
+        lon -= 360.0
+    return lon
+
+def VectorLength(vector):
+    return math.sqrt(vector.x**2 + vector.y**2 + vector.z**2)
+
+BODY_INVALID = -1
+BODY_MERCURY = 0
+BODY_VENUS = 1
+BODY_EARTH = 2
+BODY_MARS = 3
+BODY_JUPITER = 4
+BODY_SATURN = 5
+BODY_URANUS = 6
+BODY_NEPTUNE = 7
+BODY_PLUTO = 8
+BODY_SUN = 9
+BODY_MOON = 10
+
+BodyName = [
+    'Mercury',
+    'Venus',
+    'Earth',
+    'Mars',
+    'Jupiter',
+    'Saturn',
+    'Uranus',
+    'Neptune',
+    'Pluto',
+    'Sun',
+    'Moon',
+]
+
+def BodyCode(name):
+    return BodyName.index(name)
+
+def _IsSuperiorPlanet(body):
+    return body in [BODY_MARS, BODY_JUPITER, BODY_SATURN, BODY_URANUS, BODY_NEPTUNE, BODY_PLUTO]
+
+_PlanetOrbitalPeriod = [
+    87.969,
+    224.701,
+    _EARTH_ORBITAL_PERIOD,
+    686.980,
+    4332.589,
+    10759.22,
+    30685.4,
+    60189.0,
+    90560.0
+]
+
+class Error(Exception):
+    def __init__(self, message):
+        Exception.__init__(self, message)
+
+class EarthNotAllowedError(Error):
+    def __init__(self):
+        Error.__init__(self, 'The Earth is not allowed as the body.')
+
+class InvalidBodyError(Error):
+    def __init__(self):
+        Error.__init__(self, 'Invalid astronomical body.')
+
+class BadVectorError(Error):
+    def __init__(self):
+        Error.__init__(self, 'Vector is too small to have a direction.')
+
+def _SynodicPeriod(body):
+    if body == BODY_EARTH:
+        raise EarthNotAllowedError()
+    if body < 0 or body >= len(_PlanetOrbitalPeriod):
+        raise InvalidBodyError()
+    if body == BODY_MOON:
+        return _MEAN_SYNODIC_MONTH
+    return abs(_EARTH_ORBITAL_PERIOD / (_EARTH_ORBITAL_PERIOD/_PlanetOrbitalPeriod[body] - 1.0))
+
+def _AngleBetween(a, b):
+    r = VectorLength(a) * VectorLength(b)
+    if r < 1.0e-8:
+        return BadVectorError()
+    dot = (a.x*b.x + a.y*b.y + a.z*b.z) / r
+    if dot <= -1.0:
+        return 180.0
+    if dot >= +1.0:
+        return 0.0
+    return _RAD2DEG * math.acos(dot)
+
+class _delta_t_entry_t:
+    def __init__(self, mjd, dt):
+        self.mjd = mjd
+        self.dt = dt
+
+_DT = [
+_delta_t_entry_t(-72638.0, 38),
+_delta_t_entry_t(-65333.0, 26),
+_delta_t_entry_t(-58028.0, 21),
+_delta_t_entry_t(-50724.0, 21.1),
+_delta_t_entry_t(-43419.0, 13.5),
+_delta_t_entry_t(-39766.0, 13.7),
+_delta_t_entry_t(-36114.0, 14.8),
+_delta_t_entry_t(-32461.0, 15.7),
+_delta_t_entry_t(-28809.0, 15.6),
+_delta_t_entry_t(-25156.0, 13.3),
+_delta_t_entry_t(-21504.0, 12.6),
+_delta_t_entry_t(-17852.0, 11.2),
+_delta_t_entry_t(-14200.0, 11.13),
+_delta_t_entry_t(-10547.0, 7.95),
+_delta_t_entry_t(-6895.0, 6.22),
+_delta_t_entry_t(-3242.0, 6.55),
+_delta_t_entry_t(-1416.0, 7.26),
+_delta_t_entry_t(410.0, 7.35),
+_delta_t_entry_t(2237.0, 5.92),
+_delta_t_entry_t(4063.0, 1.04),
+_delta_t_entry_t(5889.0, -3.19),
+_delta_t_entry_t(7715.0, -5.36),
+_delta_t_entry_t(9542.0, -5.74),
+_delta_t_entry_t(11368.0, -5.86),
+_delta_t_entry_t(13194.0, -6.41),
+_delta_t_entry_t(15020.0, -2.70),
+_delta_t_entry_t(16846.0, 3.92),
+_delta_t_entry_t(18672.0, 10.38),
+_delta_t_entry_t(20498.0, 17.19),
+_delta_t_entry_t(22324.0, 21.41),
+_delta_t_entry_t(24151.0, 23.63),
+_delta_t_entry_t(25977.0, 24.02),
+_delta_t_entry_t(27803.0, 23.91),
+_delta_t_entry_t(29629.0, 24.35),
+_delta_t_entry_t(31456.0, 26.76),
+_delta_t_entry_t(33282.0, 29.15),
+_delta_t_entry_t(35108.0, 31.07),
+_delta_t_entry_t(36934.0, 33.150),
+_delta_t_entry_t(38761.0, 35.738),
+_delta_t_entry_t(40587.0, 40.182),
+_delta_t_entry_t(42413.0, 45.477),
+_delta_t_entry_t(44239.0, 50.540),
+_delta_t_entry_t(44605.0, 51.3808),
+_delta_t_entry_t(44970.0, 52.1668),
+_delta_t_entry_t(45335.0, 52.9565),
+_delta_t_entry_t(45700.0, 53.7882),
+_delta_t_entry_t(46066.0, 54.3427),
+_delta_t_entry_t(46431.0, 54.8712),
+_delta_t_entry_t(46796.0, 55.3222),
+_delta_t_entry_t(47161.0, 55.8197),
+_delta_t_entry_t(47527.0, 56.3000),
+_delta_t_entry_t(47892.0, 56.8553),
+_delta_t_entry_t(48257.0, 57.5653),
+_delta_t_entry_t(48622.0, 58.3092),
+_delta_t_entry_t(48988.0, 59.1218),
+_delta_t_entry_t(49353.0, 59.9845),
+_delta_t_entry_t(49718.0, 60.7853),
+_delta_t_entry_t(50083.0, 61.6287),
+_delta_t_entry_t(50449.0, 62.2950),
+_delta_t_entry_t(50814.0, 62.9659),
+_delta_t_entry_t(51179.0, 63.4673),
+_delta_t_entry_t(51544.0, 63.8285),
+_delta_t_entry_t(51910.0, 64.0908),
+_delta_t_entry_t(52275.0, 64.2998),
+_delta_t_entry_t(52640.0, 64.4734),
+_delta_t_entry_t(53005.0, 64.5736),
+_delta_t_entry_t(53371.0, 64.6876),
+_delta_t_entry_t(53736.0, 64.8452),
+_delta_t_entry_t(54101.0, 65.1464),
+_delta_t_entry_t(54466.0, 65.4573),
+_delta_t_entry_t(54832.0, 65.7768),
+_delta_t_entry_t(55197.0, 66.0699),
+_delta_t_entry_t(55562.0, 66.3246),
+_delta_t_entry_t(55927.0, 66.6030),
+_delta_t_entry_t(56293.0, 66.9069),
+_delta_t_entry_t(56658.0, 67.2810),
+_delta_t_entry_t(57023.0, 67.6439),
+_delta_t_entry_t(57388.0, 68.1024),
+_delta_t_entry_t(57754.0, 68.5927),
+_delta_t_entry_t(58119.0, 68.9676),
+_delta_t_entry_t(58484.0, 69.2201),
+_delta_t_entry_t(58849.0, 69.87),
+_delta_t_entry_t(59214.0, 70.39),
+_delta_t_entry_t(59580.0, 70.91),
+_delta_t_entry_t(59945.0, 71.40),
+_delta_t_entry_t(60310.0, 71.88),
+_delta_t_entry_t(60675.0, 72.36),
+_delta_t_entry_t(61041.0, 72.83),
+_delta_t_entry_t(61406.0, 73.32),
+_delta_t_entry_t(61680.0, 73.66)
+]
+
+def _DeltaT(mjd):
+    if mjd <= _DT[0].mjd:
+        return _DT[0].dt
+    if mjd >= _DT[-1].mjd:
+        return _DT[-1].dt    
+    # Do a binary search to find the pair of indexes this mjd lies between.
+    lo = 0
+    hi = len(_DT) - 2   # Make sure there is always an array element after the one we are looking at.
+    while True:
+        if lo > hi:
+            # This should never happen unless there is a bug in the binary search.
+            raise Error('Could not find delta-t value.')
+        c = (lo + hi) // 2
+        if mjd < _DT[c].mjd:
+            hi = c-1
+        elif mjd > _DT[c+1].mjd:
+            lo = c+1
+        else:
+            frac = (mjd - _DT[c].mjd) / (_DT[c+1].mjd - _DT[c].mjd)
+            return _DT[c].dt + frac*(_DT[c+1].dt - _DT[c].dt)
+
+def _TerrestrialTime(ut):
+    return ut + _DeltaT(ut + Y2000_IN_MJD) / 86400.0
+
+class astro_time_t:
+    def __init__(self, ut):
+        self.ut = ut
+        self.tt = _TerrestrialTime(ut)
+
+_EPOCH = datetime.datetime(2000, 1, 1, 12)
+
+def CurrentTime():
+    now = datetime.datetime.utcnow()
+    dt = now - _EPOCH
+    ut = dt.total_seconds() / 86400.0
+    return astro_time_t(ut)