Subcategories named "Astronomical objects discovered in <year>" should be sorted by discovery year, month, and day. Please use thesortkeyYYYYMMDD if all are known. Otherwise, useYYYYMM?? for unknown day, and? for unknown month and day. Astronomical objects discovered by (before 1500) should be sorted similarly, but omitting the century. For instance, the supernova of 1054 AD would be sorted as540704 as it was discovered on July 4, (10)54. Usethis search to find all pages in these subcategories that are still missing a sortkey.
