diff --git a/pyorbital/orbital.py b/pyorbital/orbital.py
index 15b6a7fd..e3399fff 100644
--- a/pyorbital/orbital.py
+++ b/pyorbital/orbital.py
@@ -98,6 +98,8 @@ def get_observer_look(sat_lon, sat_lat, sat_alt, utc_time, lon, lat, alt):
 
     Return: (Azimuth, Elevation)
     """
+
+    utc_time = dt2np(utc_time)
     (pos_x, pos_y, pos_z), (vel_x, vel_y, vel_z) = astronomy.observer_position(
         utc_time, sat_lon, sat_lat, sat_alt)
 
@@ -126,22 +128,8 @@ def get_observer_look(sat_lon, sat_lat, sat_alt, utc_time, lon, lat, alt):
 
     az_ = np.arctan(-top_e / top_s)
 
-    if has_xarray and isinstance(az_, xr.DataArray):
-        az_data = az_.data
-    else:
-        az_data = az_
-
-    if has_dask and isinstance(az_data, da.Array):
-        az_data = da.where(top_s > 0, az_data + np.pi, az_data)
-        az_data = da.where(az_data < 0, az_data + 2 * np.pi, az_data)
-    else:
-        az_data[np.where(top_s > 0)] += np.pi
-        az_data[np.where(az_data < 0)] += 2 * np.pi
-
-    if has_xarray and isinstance(az_, xr.DataArray):
-        az_.data = az_data
-    else:
-        az_ = az_data
+    az_ = np.where(top_s > 0, az_ + np.pi, az_)
+    az_ = np.where(az_ < 0, az_ + 2 * np.pi, az_)
 
     rg_ = np.sqrt(rx * rx + ry * ry + rz * rz)
     el_ = np.arcsin(top_z / rg_)