His lasting achievement is found in his book Geometria rotundi (1583), where he introduced the trigonometric functions tangent and secant.
... A-3 Falcon[?] - Curtiss A-8 Shrike[?] - Curtiss YA-10[?] - Curtiss A-12 Shrike[?] - Curtiss YA-13[?] - Northrop XA-16[?] - Northrop A-17[?] - Northrop A-20 ...