diff --git a/demo/python/astronomy.py b/demo/python/astronomy.py
index 651f9c99..6fecd277 100644
--- a/demo/python/astronomy.py
+++ b/demo/python/astronomy.py
@@ -1426,7 +1426,6 @@ class _e_tilt:
         self.deps = e.deps
         self.mobl = _mean_obliq(time.tt)
         self.tobl = self.mobl + (e.deps / 3600.0)
-        self.tt = time.tt
         self.ee = e.dpsi * math.cos(math.radians(self.mobl)) / 15.0
 
 def _ecl2equ_vec(time, ecl):
diff --git a/generate/template/astronomy.c b/generate/template/astronomy.c
index 66a433ad..00d92fdb 100644
--- a/generate/template/astronomy.c
+++ b/generate/template/astronomy.c
@@ -1194,7 +1194,6 @@ static double mean_obliq(double tt)
 /** @cond DOXYGEN_SKIP */
 typedef struct
 {
-    double tt;
     double dpsi;
     double deps;
     double ee;
@@ -1213,7 +1212,6 @@ static earth_tilt_t e_tilt(astro_time_t *time)
     et.deps = time->eps;
     et.mobl = mean_obliq(time->tt);
     et.tobl = et.mobl + (et.deps / 3600.0);
-    et.tt = time->tt;
     et.ee = et.dpsi * cos(et.mobl * DEG2RAD) / 15.0;
 
     return et;
diff --git a/generate/template/astronomy.cs b/generate/template/astronomy.cs
index 3916b105..1b396bc0 100644
--- a/generate/template/astronomy.cs
+++ b/generate/template/astronomy.cs
@@ -3162,16 +3162,14 @@ $ASTRO_JUPITER_MOONS();
 
         private struct earth_tilt_t
         {
-            public double tt;
             public double dpsi;
             public double deps;
             public double ee;
             public double mobl;
             public double tobl;
 
-            public earth_tilt_t(double tt, double dpsi, double deps, double ee, double mobl, double tobl)
+            public earth_tilt_t(double dpsi, double deps, double ee, double mobl, double tobl)
             {
-                this.tt = tt;
                 this.dpsi = dpsi;
                 this.deps = deps;
                 this.ee = ee;
@@ -3252,7 +3250,7 @@ $ASTRO_IAU_DATA()
             double mobl = mean_obliq(time.tt);
             double tobl = mobl + (time.eps / 3600.0);
             double ee = time.psi * Math.Cos(mobl * DEG2RAD) / 15.0;
-            return new earth_tilt_t(time.tt, time.psi, time.eps, ee, mobl, tobl);
+            return new earth_tilt_t(time.psi, time.eps, ee, mobl, tobl);
         }
 
         private static double era(double ut)        /* Earth Rotation Angle */
diff --git a/generate/template/astronomy.py b/generate/template/astronomy.py
index e9bacc8d..4e857fc9 100644
--- a/generate/template/astronomy.py
+++ b/generate/template/astronomy.py
@@ -890,7 +890,6 @@ class _e_tilt:
         self.deps = e.deps
         self.mobl = _mean_obliq(time.tt)
         self.tobl = self.mobl + (e.deps / 3600.0)
-        self.tt = time.tt
         self.ee = e.dpsi * math.cos(math.radians(self.mobl)) / 15.0
 
 def _ecl2equ_vec(time, ecl):
diff --git a/source/c/astronomy.c b/source/c/astronomy.c
index ff9f89cc..1078f595 100644
--- a/source/c/astronomy.c
+++ b/source/c/astronomy.c
@@ -1278,7 +1278,6 @@ static double mean_obliq(double tt)
 /** @cond DOXYGEN_SKIP */
 typedef struct
 {
-    double tt;
     double dpsi;
     double deps;
     double ee;
@@ -1297,7 +1296,6 @@ static earth_tilt_t e_tilt(astro_time_t *time)
     et.deps = time->eps;
     et.mobl = mean_obliq(time->tt);
     et.tobl = et.mobl + (et.deps / 3600.0);
-    et.tt = time->tt;
     et.ee = et.dpsi * cos(et.mobl * DEG2RAD) / 15.0;
 
     return et;
diff --git a/source/csharp/astronomy.cs b/source/csharp/astronomy.cs
index fb3edd7e..03ba6ad4 100644
--- a/source/csharp/astronomy.cs
+++ b/source/csharp/astronomy.cs
@@ -4296,16 +4296,14 @@ namespace CosineKitty
 
         private struct earth_tilt_t
         {
-            public double tt;
             public double dpsi;
             public double deps;
             public double ee;
             public double mobl;
             public double tobl;
 
-            public earth_tilt_t(double tt, double dpsi, double deps, double ee, double mobl, double tobl)
+            public earth_tilt_t(double dpsi, double deps, double ee, double mobl, double tobl)
             {
-                this.tt = tt;
                 this.dpsi = dpsi;
                 this.deps = deps;
                 this.ee = ee;
@@ -4464,7 +4462,7 @@ namespace CosineKitty
             double mobl = mean_obliq(time.tt);
             double tobl = mobl + (time.eps / 3600.0);
             double ee = time.psi * Math.Cos(mobl * DEG2RAD) / 15.0;
-            return new earth_tilt_t(time.tt, time.psi, time.eps, ee, mobl, tobl);
+            return new earth_tilt_t(time.psi, time.eps, ee, mobl, tobl);
         }
 
         private static double era(double ut)        /* Earth Rotation Angle */
diff --git a/source/python/astronomy/astronomy.py b/source/python/astronomy/astronomy.py
index 651f9c99..6fecd277 100644
--- a/source/python/astronomy/astronomy.py
+++ b/source/python/astronomy/astronomy.py
@@ -1426,7 +1426,6 @@ class _e_tilt:
         self.deps = e.deps
         self.mobl = _mean_obliq(time.tt)
         self.tobl = self.mobl + (e.deps / 3600.0)
-        self.tt = time.tt
         self.ee = e.dpsi * math.cos(math.radians(self.mobl)) / 15.0
 
 def _ecl2equ_vec(time, ecl):