Create a daily job to download the NASA Astronomy Picture of the Day

.config/systemd/user/get-nasa-apod.service

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+[Unit]
+Description=Refresh the wallpaper using the NASA Astronomy Picture of the Day
+Wants=get-nasa-apod.timer
+
+[Service]
+WorkingDirectory=%h
+ExecStart=%h/.local/bin/get-nasa-apod
+
+[Install]
+WantedBy=default.target

.config/systemd/user/get-nasa-apod.timer

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+[Unit]
+Description=Daily NASA wallpaper fetch
+Requires=get-nasa-apod.service
+
+[Timer]
+Unit=nasa-apod.service
+OnCalendar=daily
+
+[Install]
+WantedBy=timers.target