Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_52 (lunar_landing_site VARCHAR, duration_on_lunar_surface VARCHAR)

### Question ###
Where was the landing site when the duration on the lunar surface was 21:31?

### Accurate SQL ###

SELECT lunar_landing_site FROM table_name_52 WHERE duration_on_lunar_surface = "21:31"