diff --git a/astroplan/constraints.py b/astroplan/constraints.py
index 8ae78379..edbf375b 100644
--- a/astroplan/constraints.py
+++ b/astroplan/constraints.py
@@ -423,7 +423,7 @@ def _get_solar_altitudes(self, times, observer, targets):
         if not hasattr(observer, '_altaz_cache'):
             observer._altaz_cache = {}
 
-        aakey = _make_cache_key(times, 'sun')
+        aakey = _make_cache_key(times, "sun")
 
         if aakey not in observer._altaz_cache:
             try:
@@ -432,7 +432,7 @@ def _get_solar_altitudes(self, times, observer, targets):
                     observer.pressure = 0
 
                 # find solar altitude at these times
-                altaz = observer.altaz(times, observer.get_body('sun', times))
+                altaz = observer.altaz(times, observer.get_body("sun", times))
                 altitude = altaz.alt
                 # cache the altitude
                 observer._altaz_cache[aakey] = dict(times=times,
@@ -510,7 +510,7 @@ def compute_constraint(self, times, observer, targets):
         # centred frame, so the separation is as-seen
         # by the observer.
         # 'get_sun' returns ICRS coords.
-        sun = observer.get_body('sun', times)
+        sun = observer.get_body("sun", times)
         targets = get_skycoord(targets)
         solar_separation = sun.separation(targets)
 
diff --git a/astroplan/observer.py b/astroplan/observer.py
index d742b43b..d6dc49e3 100644
--- a/astroplan/observer.py
+++ b/astroplan/observer.py
@@ -607,7 +607,7 @@ def get_body(self, body, time, ephemeris=None):
         >>> from astropy.coordinates import SkyCoord
         >>> apo = Observer.at_site("APO")
         >>> time = Time('2001-02-03 04:05:06')
-        >>> target = apo.get_body('sun', time)
+        >>> target = apo.get_body("sun", time)
         """
         if not isinstance(time, Time):
             time = Time(time)
@@ -687,7 +687,7 @@ def altaz(self, time, target=None, obswl=None, grid_times_targets=False):
             if target is MoonFlag:
                 target = self.get_body("moon", time)
             elif target is SunFlag:
-                target = self.get_body('sun', time)
+                target = self.get_body("sun", time)
 
             time, target = self._preprocess_inputs(time, target, grid_times_targets)
 
@@ -1440,7 +1440,7 @@ def sun_rise_time(self, time, which='nearest', horizon=0*u.degree, n_grid_points
         >>> print("ISO: {0.iso}, JD: {0.jd}".format(sun_rise)) # doctest: +SKIP
         ISO: 2001-02-02 14:02:50.554, JD: 2451943.08531
         """
-        return self.target_rise_time(time, self.get_body('sun', time), which, horizon,
+        return self.target_rise_time(time, self.get_body("sun", time), which, horizon,
                                      n_grid_points=n_grid_points)
 
     @u.quantity_input(horizon=u.deg)
@@ -1491,7 +1491,7 @@ def sun_set_time(self, time, which='nearest', horizon=0*u.degree, n_grid_points=
         >>> print("ISO: {0.iso}, JD: {0.jd}".format(sun_set)) # doctest: +SKIP
         ISO: 2001-02-04 00:35:42.102, JD: 2451944.52479
         """
-        return self.target_set_time(time, self.get_body('sun', time), which, horizon,
+        return self.target_set_time(time, self.get_body("sun", time), which, horizon,
                                     n_grid_points=n_grid_points)
 
     def noon(self, time, which='nearest', n_grid_points=150):
@@ -1520,7 +1520,7 @@ def noon(self, time, which='nearest', n_grid_points=150):
         `~astropy.time.Time`
             Time at solar noon
         """
-        return self.target_meridian_transit_time(time, self.get_body('sun', time), which,
+        return self.target_meridian_transit_time(time, self.get_body("sun", time), which,
                                                  n_grid_points=n_grid_points)
 
     def midnight(self, time, which='nearest', n_grid_points=150):
@@ -1549,7 +1549,7 @@ def midnight(self, time, which='nearest', n_grid_points=150):
         `~astropy.time.Time`
             Time at solar midnight
         """
-        return self.target_meridian_antitransit_time(time, self.get_body('sun', time), which,
+        return self.target_meridian_antitransit_time(time, self.get_body("sun", time), which,
                                                      n_grid_points=n_grid_points)
 
     # Twilight convenience functions
@@ -1935,7 +1935,7 @@ def sun_altaz(self, time):
         if not isinstance(time, Time):
             time = Time(time)
 
-        sun = self.get_body('sun', time)
+        sun = self.get_body("sun", time)
         return self.altaz(time, sun)
 
     @u.quantity_input(horizon=u.deg)
@@ -2045,7 +2045,7 @@ def is_night(self, time, horizon=0*u.deg, obswl=None):
         if not isinstance(time, Time):
             time = Time(time)
 
-        solar_altitude = self.altaz(time, target=self.get_body('sun', time), obswl=obswl).alt
+        solar_altitude = self.altaz(time, target=self.get_body("sun", time), obswl=obswl).alt
 
         if solar_altitude.isscalar:
             return bool(solar_altitude < horizon)