Analytical Graphics, Inc. (AGI), headquartered in the Great Valley Corporate Center near Philadelphia, PA, is the leading producer of commercial off-the-shelf (COTS) solutions for the aerospace industry. Satellite Tool Kit® (STK), AGI's flagship product, is the core of a suite of software solutions for aerospace-related applications. Credit Information: Project Manager: Robert Hall/Fran Maley Web Site Design: Tobey & Company Graphics: Tobey & Company/Hao Chang Animations: Scott Cross, Edward Gee & Wes Bradley