diff --git a/spatz/simulations/astos/transforms.py b/spatz/simulations/astos/transforms.py
new file mode 100644
index 0000000..0a765a1
--- /dev/null
+++ b/spatz/simulations/astos/transforms.py
@@ -0,0 +1,36 @@
+import math
+
+import numpy as np
+
+
+DEG_TO_RADS = math.pi / 180
+
+
+def T1(angle, degrees=False):
+    angle = angle * DEG_TO_RADS if degrees else angle
+
+    return np.array([
+        [1, 0, 0],
+        [0, math.cos(angle), math.sin(angle)],
+        [0, -math.sin(angle), math.cos(angle)],
+    ])
+
+
+def T2(angle, degrees=False):
+    angle = angle * DEG_TO_RADS if degrees else angle
+
+    return np.array([
+        [math.cos(angle), 0, -math.sin(angle)],
+        [0, 1, 0],
+        [math.sin(angle), 0, math.cos(angle)]
+    ])
+
+
+def T3(angle, degrees=False):
+    angle = angle * DEG_TO_RADS if degrees else angle
+
+    return np.array([
+        [math.cos(angle), math.sin(angle), 0],
+        [-math.sin(angle), math.cos(angle), 0],
+        [0, 0, 1]
+    ])
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