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_21091 ( "Name" text, "Latitude" text, "Longitude" text, "Diameter (km)" text, "Year named" real, "Name origin" text )

### Question ###
Name the total number of year named for athena , greek goddess of wisdom .

### Accurate SQL ###

SELECT COUNT("Year named") FROM table_21091 WHERE "Name origin" = 'Athena , Greek goddess of wisdom .'