diff --git a/getInputPointing.py b/getInputPointing.py
index 1fc02f13d647f97df8af2cb3bb69229ac1700b91..62025656bb8ddc87c9e064294796ab23b3861d6e 100755
--- a/getInputPointing.py
+++ b/getInputPointing.py
@@ -102,7 +102,29 @@ class Chip(object):
 
         return galsim.PositionD(xcen, ycen)
 
+def transRaDec2D(ra, dec):
+    x1 = np.cos(dec / 57.2957795) * np.cos(ra / 57.2957795);
+    y1 = np.cos(dec / 57.2957795) * np.sin(ra / 57.2957795);
+    z1 = np.sin(dec / 57.2957795);
+    return np.array([x1, y1, z1])
 
+def getobsPA(ra, dec):
+    l1 = np.array([0,0,1])
+    l2 = transRaDec2D(ra, dec)
+    polar_ec = coord.SkyCoord(0*u.degree, 90*u.degree,frame='barycentrictrueecliptic')
+    polar_eq = polar_ec.transform_to('icrs')
+
+    # print(polar_eq.ra.value,polar_eq.dec.value)
+    polar_d = transRaDec2D(polar_eq.ra.value, polar_eq.dec.value)
+    l1l2cross = np.cross(l2,l1)
+    pdl2cross = np.cross(l2,polar_d)
+    angle = math.acos(np.dot(l1l2cross,pdl2cross)/(np.linalg.norm(l1l2cross)*np.linalg.norm(pdl2cross)))
+
+    angle = (angle)/math.pi*180
+
+    # if (ra>90 and ra< 270):
+    #     angle=-angle
+    return angle
 
 
 # @jit()
@@ -165,7 +187,7 @@ def getSelectPointingList(center = [60,-40], radius = 2):
         p_result[i,1] = dec
         p_result[i,2] = lon
         p_result[i,3] = lat
-        p_result[i,4] = -113.4333
+        p_result[i,4] = getobsPA(ra, dec) + 90
         i = i + 1
     
     return p_result