1 files changed, 19 insertions, 1 deletions
diff --git a/docs/source/projections/hatano.rst b/docs/source/projections/hatano.rst
index 6660a689..bcc66c61 100644
--- a/docs/source/projections/hatano.rst
+++ b/docs/source/projections/hatano.rst
@@ -6,5 +6,23 @@ Hatano Asymmetrical Equal Area
 
 .. image:: ./images/hatano.png
    :scale: 50%
-   :alt:   Hatano Asymmetrical Equal Area  
+   :alt:   Hatano Asymmetrical Equal Area
+
+
+.. math::
+
+   \begin{array}
+
+   x &= 0.85\lambda cos \theta
+
+   y &= C_y sin \theta
+
+   P(\theta) &= 2\theta + sin 2\theta - C_p sin \phi
+
+   P'(\theta) &= 2(1 + cos 2\theta)
+
+   \theta_0 &= 2\phi
+
+   \end{array}
+