diff --git a/misc/deg.py b/misc/deg.py
new file mode 100644
index 0000000..8012f1d
--- /dev/null
+++ b/misc/deg.py
@@ -0,0 +1,22 @@
+from decimal import Decimal as Dec
+
+Deg = namedtuple('Deg', ['hh', 'mm', 'ss'])
+
+def guess(inp):
+    if isinstance(inp, Dec):
+        return inp
+
+    if '-' in instr:
+        deg, mm, ss = instr.split('-')
+        ddeg, dmm, dss = Dec(deg), Dec(mm), Dec(ss)
+        return deg + dmm/60 + dss/3600
+    else:
+        return Dec(instr)
+
+def hms(deg):
+    assert isinstance(deg, Dec)
+    pdeg, pmm = divmod(deg, 1)
+    pmm = pmm * Dec(60)
+    pmm, pss = divmod(pmm, 1)
+    pss = pss * Dec(60)
+    return Deg(pdeg, pmm, pss)