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_46755 ( "Team" text, "Outgoing manager" text, "Manner of departure" text, "Date of vacancy" text, "Replaced by" text, "Date of appointment" text, "Position in table" text )

### Question ###
What was the manner of departure for the vacancy date of 20 September 2009?

### Accurate SQL ###

SELECT "Manner of departure" FROM table_46755 WHERE "Date of vacancy" = '20 september 2009'