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At Georgetown Observatory, in 1850, Sestini made a series of sunspot drawings, which were engraved and published (44 plates) as "Appendix A" of the Naval Observatory volume for 1847, printed in 1853.
The Hubble Space Telescope's Blinking Planetary image credit goes to astronomers Bruce Balick of the University of Washington; Jason Alexander, University of Washington; Arsen Hajian, U.S. Naval Observatory, Washington, D.C.; Mario Perinotto, University of Florence (Italy); Patrizio Patriarchi, Arcetri Observatory (Italy); and Cornell's Terzian, who used a special instrument with the Hubble Telescope known as WFPC2 (pronounced "wiffpick two").
The first director of the new institution was Francisco Beuf (lieutenant of the French Army and director of the Naval Observatory of Toulon).
In 1877 while the McCormick Refractor was still in Cambridgeport, Alvan Clark used it to verify the discovery of the moons of Mars the night after the discovery observations were made by Asaph Hall with the Naval Observatory refractor.
Robert Sutton Harrington (1942–1993), astronomer, worked at the US Naval Observatory
In November 1913 the Paris Observatory, using the Eiffel Tower as an antenna, exchanged sustained wireless (radio) signals with the United States Naval Observatory, using an antenna in Arlington, Virginia to determine the exact difference of longitude between the two institutions.
He was astronomical director of the Naval Observatory (1894–99) and director of the Nautical Almanac (1897–99).