How many years is it's rotation? nostr:nevent1qqsfyu7gj8lv5fm0sya2nhed4narln26aw70d0qsl7uae7gkt9surugpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtczyrzc9tmcml6yyuqwck0zz7r9x2nswnqqh69hk84vnzdm7cnfsp5ucqcyqqqqqqg3scdd5