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_19517621_4 ( original_airdate VARCHAR, title VARCHAR )

### Question ###
What was the original air date for the episode Calle, The Transit of Venus?

### Accurate SQL ###

SELECT original_airdate FROM table_19517621_4 WHERE title = "The Transit of Venus"