Telomelonia · Dec 23, 2022 · Dec 23, 2022 · Dec 24, 2022 · Dec 24, 2022 · Dec 24, 2022
diff --git a/astropy/coordinates/angles.py b/astropy/coordinates/angles.py
@@ -209,6 +209,7 @@ def to_string(
         pad=False,
         fields=3,
         format=None,
+        oldstyle=False,
     ):
         """A string representation of the angle.
 
@@ -272,6 +273,14 @@ def to_string(
             - 'unicode': Return a string containing non-ASCII unicode
               characters, such as the degree symbol
 
+        oldstyle : bool, optional
+            If `False`, include a space between value and unit. If `True`,
+            no space is included. This option does not work with 'latex' or 'unicode'
+            format. In v5.3 onwards, a space is generated by default; set ``oldstyle=True``
+            for backward compatibility with older versions of ``astropy``.
+
+            .. versionadded:: 5.3
+
         Returns
         -------
         strrepr : str or array
@@ -325,7 +334,12 @@ def to_string(
                 if format == "latex" or format == "latex_inline":
                     unit_string = unit_string[1:-1]
                 format_func = func
-                func = lambda x: format_func(x) + unit_string
+                # Add a space if no format(i.e unicode or latex) is given
+                func = lambda x: (
+                    format_func(x)
+                    + (" " * ((format == None) and (oldstyle is False)))
+                    + unit_string
+                )
 
         def do_format(val):
             # Check if value is not nan to avoid ValueErrors when turning it into

diff --git a/astropy/coordinates/tests/test_angles.py b/astropy/coordinates/tests/test_angles.py
@@ -352,7 +352,7 @@ def string(self, unit=DEGREE, decimal=False, sep=" ", precision=5,
         f"Angle as DMS: {angle.to_string(unit=u.degree, precision=4, pad=True)}" == res
     )
 
-    res = "Angle as rad: 0.0629763rad"
+    res = "Angle as rad: 0.0629763 rad"
     assert f"Angle as rad: {angle.to_string(unit=u.radian)}" == res
 
     res = "Angle as rad decimal: 0.0629763"
@@ -588,9 +588,9 @@ def test_angle_string():
     a = Angle("00:00:59W", u.hour)
     assert str(a) == "-0h00m59s"
     a = Angle(3.2, u.radian)
-    assert str(a) == "3.2rad"
+    assert str(a) == "3.2 rad"
     a = Angle(4.2, u.microarcsecond)
-    assert str(a) == "4.2uarcsec"
+    assert str(a) == "4.2 uarcsec"
     a = Angle("1.0uarcsec")
     assert a.value == 1.0
     assert a.unit == u.microarcsecond
@@ -1096,8 +1096,8 @@ def parse_test(i=0):
             "[nan, nan, nan] hourangle",
         ),
         (np.nan * u.rad, "nan", "nan rad"),
-        ([np.nan, 1, 0] * u.rad, "[nan 1rad 0rad]", "[nan, 1., 0.] rad"),
-        ([1.50, np.nan, 0] * u.rad, "[1.5rad nan 0rad]", "[1.5, nan, 0.] rad"),
+        ([np.nan, 1, 0] * u.rad, "[nan 1 rad 0 rad]", "[nan, 1., 0.] rad"),
+        ([1.50, np.nan, 0] * u.rad, "[1.5 rad nan 0 rad]", "[1.5, nan, 0.] rad"),
         ([np.nan, np.nan, np.nan] * u.rad, "[nan nan nan]", "[nan, nan, nan] rad"),
     ],
 )

diff --git a/astropy/coordinates/tests/test_formatting.py b/astropy/coordinates/tests/test_formatting.py
@@ -148,7 +148,7 @@ def test_to_string_radian_with_precision():
 
     # Check that specifying the precision works
     a = Angle(3.0, unit=u.rad)
-    assert a.to_string(precision=3, sep="fromunit") == "3.000rad"
+    assert a.to_string(precision=3, sep="fromunit") == "3.000 rad"
 
 
 def test_sexagesimal_round_down():

diff --git a/docs/changes/coordinates/14231.feature.rst b/docs/changes/coordinates/14231.feature.rst
@@ -0,0 +1 @@
+The ``oldstyle`` option is now available for ``to_string``.
diff --git a/docs/coordinates/angles.rst b/docs/coordinates/angles.rst
@@ -105,7 +105,7 @@ There are many ways to represent the value of an |Angle|::
     >>> f"{a.to(u.deg):latex}"
     '$57^\\circ17{}^\\prime44.8062471{}^{\\prime\\prime}$'
     >>> a.to_string()
-    '1rad'
+    '1 rad'
     >>> a.to_string(unit=u.degree)
     '57d17m44.8062471s'
     >>> a.to_string(unit=u.degree, sep=':')
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		The ``oldstyle`` option is now available for ``to_string``.
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