diff --git a/backend/requirements.txt b/backend/requirements.txt
index 9d105a3..371158f 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -29,3 +29,9 @@ Pillow==10.1.0
 
 # Date handling
 python-dateutil==2.8.2
+
+# Scheduler
+apscheduler==3.10.4
+
+# Astronomy calculations
+skyfield==1.48