What was the original air date for the episode Calle, The Transit of Venus?
CREATE TABLE table_19517621_4 (
    original_airdate VARCHAR,
    title VARCHAR
)
SELECT original_airdate FROM table_19517621_4 WHERE title = "The Transit of Venus"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the original air date for the episode Calle, The Transit of Venus? ### Input: CREATE TABLE table_19517621_4 (
    original_airdate VARCHAR,
    title VARCHAR
) ### Response: SELECT original_airdate FROM table_19517621_4 WHERE title = "The Transit of Venus"