1 files changed, 34 insertions, 0 deletions
diff --git a/src/projections/august.cpp b/src/projections/august.cpp
new file mode 100644
index 00000000..b5a21ef7
--- /dev/null
+++ b/src/projections/august.cpp
@@ -0,0 +1,34 @@
+#define PJ_LIB__
+
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(august, "August Epicycloidal") "\n\tMisc Sph, no inv";
+#define M 1.333333333333333
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+	double t, c1, c, x1, x12, y1, y12;
+	(void) P;
+
+	t = tan(.5 * lp.phi);
+	c1 = sqrt(1. - t * t);
+	c = 1. + c1 * cos(lp.lam *= .5);
+	x1 = sin(lp.lam) *  c1 / c;
+	y1 =  t / c;
+	xy.x = M * x1 * (3. + (x12 = x1 * x1) - 3. * (y12 = y1 *  y1));
+	xy.y = M * y1 * (3. + 3. * x12 - y12);
+	return (xy);
+}
+
+
+
+
+PJ *PROJECTION(august) {
+    P->inv = nullptr;
+    P->fwd = s_forward;
+    P->es = 0.;
+    return P;
+}