Daily map file

One real map.
Its date, redacted.

Every day the archive releases a genuine historical map with the dates blacked out. Read the names on it — empires, colonies, countries that no longer exist — and pin down the year of publication in six guesses.

• Evidence after each miss, the archivist files one name from the map as evidence — open the file entry to see what it proves.
• Direction every miss says whether the true year is earlier or later.
• Temperature hot within 2 · warm within 9 · cool within 24 · cold beyond.

A new map at midnight, your time. All maps are real, public-domain scans.