CREATE TABLE table_name_16 (inclination VARCHAR, semimajor_axis___au__ VARCHAR)

What inclination has a semimajor axis of 20 au?
SELECT inclination FROM table_name_16 WHERE semimajor_axis___au__ = "20 au"
SELECT "inclination" FROM "table_name_16" WHERE "20 au" = "semimajor_axis___au__"