| Date | Event |
|---|
| 1829, Oct. 15 | Born, Goshen, Conn. |
| 1856 | Married Chloe Angeline Stickney (died 1892) |
| 1857-1862 | Assistant, Harvard College Observatory, Cambridge, Mass. |
| 1862 | Aide, U.S. Naval Observatory, Washington, D.C. |
| 1864 | Professor of mathematics, U.S. Naval Observatory, Washington, D.C. |
| 1877 | Discovered the two moons of Mars |
| 1891 | Retired from the U.S. Naval Observatory |
| 1897 | Married Mary Bertha Gauthier |
| 1907, Nov. 22 | Died, Annapolis, Md. |
| Date | Event |
|---|
| 1859, Oct. 6 | Born, Cambridge, Mass. |
| 1882 | A.B., Harvard College, Cambridge, Mass. |
| 1882-1885 | Assistant, U.S. Naval Observatory, Washington, D.C. |
| 1885-1889 | Assistant Astronomer, Yale Observatory, New Haven, Conn. |
| 1889 | Ph.D., Yale University, New Haven, Conn. |
| 1889-1892 | Professor of Astronomy and Director of the Observatory, University of Michigan, Ann Arbor, Mich. |
| 1889 | Married Mary Estella Cockrell |
| 1905-1908 | Assistant, U.S. Naval Observatory, Washington, D.C. |
| 1908 | Professor of mathematics, U.S. Navy |
| 1930, Jan. 12 | Died |
