diff --git a/source/conf.py b/source/conf.py
index 925cf48e7d..eba692f292 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -13,6 +13,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import uszipcode
 import sys
 import os
 import shlex
@@ -67,9 +68,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.0.7'
+version = uszipcode.__version__
 # The full version, including alpha/beta/rc tags.
-release = '0.0.7'
+release = uszipcode.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/uszipcode/__init__.py b/uszipcode/__init__.py
index e3369c8d9f..cc593f9e61 100644
--- a/uszipcode/__init__.py
+++ b/uszipcode/__init__.py
@@ -3,6 +3,6 @@
 
 from .searchengine import ZipcodeSearchEngine
 
-__version__ = "0.0.8"
+__version__ = "0.0.9"
 __short_description__ = ("USA zipcode programmable database, includes "
                          "up-to-date census and geometry information.")
\ No newline at end of file
diff --git a/uszipcode/searchengine.py b/uszipcode/searchengine.py
index 93ccb7990c..d25c6cf39b 100644
--- a/uszipcode/searchengine.py
+++ b/uszipcode/searchengine.py
@@ -11,6 +11,7 @@
 import math
 import json
 
+
 class Zipcode(object):
     """Zipcode class. Attributes includes:
     
@@ -79,6 +80,7 @@ def __bool__(self):
           
 _DEFAULT_LIMIT = 5
 
+
 class ZipcodeSearchEngine(object):
     """A fast, powerful index optimized zipcode object search engine class.
     
@@ -183,8 +185,8 @@ def by_coordinate(self, lat, lng, radius=20, standard_only=True,
         # define lat lng boundary
         dist_btwn_lat_deg = 69.172
         dist_btwn_lon_deg = math.cos(lat) * 69.172
-        lat_degr_rad = radius * 1.0/dist_btwn_lat_deg
-        lon_degr_rad = radius * 1.0/dist_btwn_lon_deg
+        lat_degr_rad = abs(radius * 1.0/dist_btwn_lat_deg)
+        lon_degr_rad = abs(radius * 1.0/dist_btwn_lon_deg)
     
         lat_lower = lat - lat_degr_rad
         lat_upper = lat + lat_degr_rad
diff --git a/uszipcode/zzz_manual_install.py b/uszipcode/zzz_manual_install.py
index 70385676ea..c2b210ddf0 100644
--- a/uszipcode/zzz_manual_install.py
+++ b/uszipcode/zzz_manual_install.py
@@ -118,12 +118,16 @@
 """
 
 from __future__ import print_function, unicode_literals
-import hashlib, site, shutil, os 
+import hashlib
+import site
+import shutil
+import os
 
 _ROOT = os.getcwd()
 _PACKAGE_NAME = os.path.basename(_ROOT)
 _DST = os.path.join(site.getsitepackages()[1], _PACKAGE_NAME)
-    
+
+
 def md5_of_file(abspath):
     """Md5 value of a file.
     """
@@ -137,6 +141,7 @@ def md5_of_file(abspath):
             m.update(data)
     return m.hexdigest()
 
+
 def check_need_install():
     """Check if installed package are exactly the same to this one.
     """
@@ -153,7 +158,8 @@ def check_need_install():
                 else:
                     return True
     return need_install_flag
-    
+
+
 def install():
     """Manual install main script.
     """
@@ -164,18 +170,18 @@ def install():
         print("\tpackage is up-to-date, no need to install.")
         return
     print("Difference been found, start installing ...")
-    
+
     # remove __pycache__ folder and *.pyc file
-    print("Remove *.pyc file ...")  
+    print("Remove *.pyc file ...")
     pyc_folder_list = list()
     for root, _, basename_list in os.walk(_ROOT):
         if os.path.basename(root) == "__pycache__":
             pyc_folder_list.append(root)
-     
+
     for folder in pyc_folder_list:
         shutil.rmtree(folder)
     print("\tall *.pyc file has been removed.")
-       
+
     # install this package to all python version
     print("Uninstall %s from %s ..." % (_PACKAGE_NAME, _DST))
     try:
@@ -183,10 +189,10 @@ def install():
         print("\tSuccessfully uninstall %s" % _PACKAGE_NAME)
     except Exception as e:
         print("\t%s" % e)
-       
+
     print("Install %s to %s ..." % (_PACKAGE_NAME, _DST))
-    shutil.copytree(_ROOT, _DST)     
+    shutil.copytree(_ROOT, _DST)
     print("\tComplete!")
-        
+
 if __name__ == "__main__":
     install()
\ No newline at end of file