diff --git a/crates/lox-orbits/src/python.rs b/crates/lox-orbits/src/python.rs
index 49789935..9a7dc1fb 100644
--- a/crates/lox-orbits/src/python.rs
+++ b/crates/lox-orbits/src/python.rs
@@ -906,7 +906,7 @@ impl PyElevationMask {
     }
 
     fn __getnewargs__(&self) -> (Option<Vec<f64>>, Option<Vec<f64>>, Option<f64>) {
-        (self.azimuth(), self.elevation(), self.min_elevation())
+        (self.azimuth(), self.elevation(), self.fixed_elevation())
     }
 
     fn azimuth(&self) -> Option<Vec<f64>> {
@@ -923,12 +923,16 @@ impl PyElevationMask {
         }
     }
 
-    fn min_elevation(&self) -> Option<f64> {
+    fn fixed_elevation(&self) -> Option<f64> {
         match &self.0 {
             ElevationMask::Fixed(min_elevation) => Some(*min_elevation),
             ElevationMask::Variable(_) => None,
         }
     }
+
+    fn min_elevation(&self, azimuth: f64) -> f64 {
+        self.0.min_elevation(azimuth)
+    }
 }
 
 #[pyclass(name = "Observables", module = "lox_space", frozen)]
diff --git a/crates/lox-space/lox_space.pyi b/crates/lox-space/lox_space.pyi
index 438f517a..3a187233 100644
--- a/crates/lox-space/lox_space.pyi
+++ b/crates/lox-space/lox_space.pyi
@@ -11,9 +11,14 @@ class Ensemble:
     def __new__(cls, ensemble: dict[str, Trajectory]): ...
 
 class ElevationMask:
-    def __new__(cls, azimuth: np.ndarray, elevation: np.ndarray): ...
+    @classmethod
+    def variable(cls, azimuth: np.ndarray, elevation: np.ndarray) -> Self: ...
     @classmethod
     def fixed(cls, min_elevation: float) -> Self: ...
+    def azimuth(self) -> list[float] | None: ...
+    def elevation(self) -> list[float] | None: ...
+    def fixed_elevation(self) -> float | None: ...
+    def min_elevation(self, azimuth: float) -> float: ...
 
 def find_events(
     func: Callable[[float], float], start: Time, times: list[float]
diff --git a/crates/lox-space/tests/test_ground.py b/crates/lox-space/tests/test_ground.py
index 5d264f0b..0cf7bf39 100644
--- a/crates/lox-space/tests/test_ground.py
+++ b/crates/lox-space/tests/test_ground.py
@@ -20,3 +20,10 @@ def test_observables():
     assert observables.range_rate() == pytest.approx(expected_range_rate, rel=1e-2)
     assert observables.azimuth() == pytest.approx(expected_azimuth, rel=1e-2)
     assert observables.elevation() == pytest.approx(expected_elevation, rel=1e-2)
+
+
+def test_elevation_mask():
+    mask = lox.ElevationMask.variable(
+        np.array([-np.pi, 0.0, np.pi]), np.array([0.0, 5.0, 0.0])
+    )
+    assert mask.min_elevation(np.pi / 2) == 2.5