The query "when did 9" is ambiguous and does not specify a clear context or subject to provide a direct answer. If the question pertains to the number 9 in a historical, mathematical, or cultural context, or if it refers to a specific date or event involving the number 9, please clarify for a precise response. From the search results, there is no direct or meaningful match to "when did 9" as a standalone phrase or query. Please provide more details or specify the topic related to "9" for further assistance.