Dava Sobel
U.S. Coast and Geodetic Survey.
Robert Hues
John Tapp
Thomas Streete
Kathryn Lasky
Fleming, Sandford Sir
Santa Cruz, Alonso de
Tracy Nelson Maurer
John Hadley
Eugene Dernay
Alfred Challice Johnson
Great Britain Nautical Almanac Office
Rupert Thomas Gould
Richard Dunn
Simon Newcomb
Croswell, William
William Leavitt
James, Thomas
Guillaume de Nautonier