In recent decades, the number of satellites being built and launched into Earth’s orbit has grown immensely, alongside the field of space engineering itself. This book offers an in-depth guide to engineers and professionals seeking to understand the technologies behind Low Earth Orbit satellites. With access to special spreadsheets that provide the key equations and relationships needed for mastering spacecraft design, this book gives the growing crop of space engineers and professionals the tools and resources they need to prepare their own LEO satellite designs, which is especially useful for designers of small satellites such as those launched by universities. Each chapter breaks down the various mathematics and principles underlying current spacecraft software and hardware designs.  In recent decades, the number of satellites being built and launched into Earth’s orbit has grown immensely, alongside the field of space engineering itself. This book offers an in-depth guide to engineers and professionals seeking to understand the technologies behind Low Earth Orbit satellites. With access to special spreadsheets that provide the key equations and relationships needed for mastering spacecraft design, this book gives the growing crop of space engineers and professionals the tools and resources they need to prepare their own LEO satellite designs, which is especially useful for designers of small satellites such as those launched by universities. Each chapter breaks down the various mathematics and principles underlying current spacecraft software and hardware designs. The principal author, Dr. George Sebestyen, has an extensive background helping to design 34 different spacecraft. He founded and was President of Defense Systems, Inc. (now part of ATKOrbital).  Steve Fujikawa is a spacecraft attitude determination and control system (ADACS) specialist, and the President of Maryland Aerospace Inc. Mr. Alex Chuchra is a spacecraft thermal design specialist with extensive NASA experience. Mr. Nick Galassi is a spacecraft structural analyst with NASA and other private spacecraft programs. The combined expertise of this group has resulted in this brief but comprehensive engineering design handbook to aid the practical LEO spacecraft designer.