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Notes and Sources, page 251.

Information about O'Keefe and his views (pages 85 and 86) came from my interview with John O'Keefe.

Views about Frank McClure's character (page 87) came from nearly every member of the Transit team that I interviewed.

Frank McClure's ideas for a navigation satellite are in a memo dated March 18, 1958, reproduced in The First 40 Years, JHU APL (Johns Hopkins University Press).

What McClure said to Guier and Weiffenbach about his satellite navigation idea is a story that both told me separately (page 88).


Chapter nine: Kersher's Roulette

Comments about Richard Kershner (page 91), his approach to the job of team leader and to engineering, are based on the views of different Transit team members.

The First 'Transit Proposal, 4 April 1958, (APL Archives) gives details of the satellite and incorrectly suggests that the ionosphere might be the biggest problem facing satellite navigation (pages 92-94).

Limits on orbital configuration and its relationship to ground stations (page 94) are from interviews with Guier and Weiffenbach.

The section in this chapter on the search for longitude had a number of secondary sources:
John Harrison: The Man who Found Longitude, by Humphry Quill (Baker, 1966).
History of the Invention by John Harrison of the Marine Chronometer, by Samuel Smiles (Press Print).
Memoirs of a trait in the character if George III of these United Kingdoms,
by John Harrison (W Edwards, 1835).
John Harrison and The problem of Longitude, by Heather and Mervyn
Hobden (Cosmic Elk, 1989).
"The Longitude," an essay by Lloyd A. Brown in volume two of The
World Mathematics, edited by James R. Newman (Tempus, 1956).

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