Sky Sports | Sky News | Sky | Sky Sports News | Sloan Digital Sky Survey | Sky News Australia | The Sky at Night | Sky (UK and Ireland) | Sky Living | Sky King | Lucy in the Sky with Diamonds | Explosions in the Sky | Reach for the Sky | Phoenix Sky Harbor International Airport | compass | Light Up the Sky | Blue Sky Studios | Big Sky, Montana | SKY México | Sky Captain and the World of Tomorrow | Sky Atlantic | Cabin in the Sky | Bullet the Blue Sky | Vanilla Sky | Two Thousand Acres of Sky | Tata Sky | Steal the Sky | Sky Full of Holes | Sky Burial | Sky Blue FC |
He also invented the Pfund telescope, which is a method for achieving a fixed telescope focal point regardless of where the telescope line of sight is positioned, and the Pfund sky compass, which arose from Pfund's studies of the polarization of scattered light from the sky in 1944, and which greatly helped transpolar flights by allowing the determination of the Sun's direction in twilight.