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_16 (inclination VARCHAR, semimajor_axis___au__ VARCHAR)

### Question ###
What inclination has a semimajor axis of 20 au?

### Accurate SQL ###

SELECT inclination FROM table_name_16 WHERE semimajor_axis___au__ = "20 au"