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Notes and Sources, page 248.

Broughton, and on From Sails to Satellites: The Origin and Development of Navigational Science, by J.E.D. Williams (Oxford University Press, 1992).

Transit's status as brickbat-01 and the meaning of this terminology (page 53) emerged during interviews with Transit team members.

The fact that radars capable of detecting a periscope's wake were being developed at the end of the 1950s and in the early 1960s (page 54) comes from George Weiffenbach.

How the technology of the Transit receivers evolved (page 55) comes fiom Tom Stansill and from papers and old sale brochures that he sent to me.

The history of APL (page 56) comes from The First 40 Years,JHU APL (Johns Hopkins University Press, 1983).

Notes about Frank McClure's and Richard Kershner's previous careers (page 56) come from The First 40 Years, JHU APL and from press releases and briefing papers sent to me by Helen Worth, the APL's press officer.

The fact that Ralph Gibson was sounded out as a potential first director of the Defense Research Establishment is mentioned by Admiral William Raborn, head of the Fleet Ballistic Missile program until 1962, in an oral history at the Naval Historical Center, in Washington, DC (page 57).

Chapter six: Heady Days

The contents of the National Security Council's agenda and mention of Lay's phone calls to Alan Waterman (page 58) are among Waterman's papers in the Library of Congress.

Information about Tycho Brahe and Johannes Kepler (page 59) comes principally from an essay on Kepler by Sir Oliver Lodge in The World of Mathematics, edited by James R. Newton (Tempus, 1956). Textbooks consulted for pages 60 and 61 are Introduction to Space: The Science of Spaceflight. by Thomas D. Damon. A foundation series book, chapter three deals with orbits (Orbit Book Company, 1989); The Feynman Lectures on Physics, volume one, chapter 7 (Addison Wesley, 1963).

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