diff --git a/astronomy/celestial_calculator.py b/astronomy/celestial_calculator.py
index 28b0094..8a5ea33 100644
--- a/astronomy/celestial_calculator.py
+++ b/astronomy/celestial_calculator.py
@@ -23,7 +23,7 @@ def __init__(self, latitude, longitude, elevation=0):
             self.ts = load.timescale()
             
             # Load comprehensive SPICE kernel
-            self.planets = load('de440.bsp')
+            self.planets = load('de440s.bsp')
             
             # Create observer location
             self.location = Topos(
@@ -389,4 +389,4 @@ def _generate_dates(self, start_date, end_date):
         while current <= end_date:
             dates.append(current)
             current += timedelta(days=1)
-        return dates
\ No newline at end of file
+        return dates