diff --git a/.git_archival.txt b/.git_archival.txt
new file mode 100644
index 0000000..95cb3ee
--- /dev/null
+++ b/.git_archival.txt
@@ -0,0 +1 @@
+ref-names: $Format:%D$
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..00a7b00
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+.git_archival.txt  export-subst
diff --git a/Ska/Sun.py b/Ska/Sun.py
index d88cc64..99d99ba 100755
--- a/Ska/Sun.py
+++ b/Ska/Sun.py
@@ -8,8 +8,9 @@
 from math import cos, sin, acos, atan2, asin, pi, radians, degrees, ceil
 import numpy as np
 import Ska.quatutil
+import ska_helpers
 
-__version__ = '3.5'
+__version__ = ska_helpers.get_version(__package__)
 
 
 # The position() method is a modification of
diff --git a/setup.py b/setup.py
index 9652af3..9e51656 100755
--- a/setup.py
+++ b/setup.py
@@ -1,14 +1,13 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 from setuptools import setup
 
-from Ska.Sun import __version__
-
 setup(name='Ska.Sun',
       author = 'Jean Connelly',
       description='Sun position calculator',
       author_email = 'jeanconn@head.cfa.harvard.edu',
       py_modules = ['Ska.Sun'],
-      version=__version__,
+      use_scm_version=True,
+      setup_requires=['setuptools_scm', 'setuptools_scm_git_archive'],
       zip_safe=False,
       packages=['Ska'],
       package_dir={'Ska' : 'Ska'},