|Birth Day||December 17, 1837|
|Age||182 YEARS OLD|
|Died On||Feb 28, 1903 (age 65)|
19th-century Astronomer who designed telescopes and served on the Transit of Venus commission. He also invented the spherometer caliper.
He studied at Lafayette College in Pennsylvania and at the University of Rochester (New York state) before moving to New York City to train as a physician. During the Civil War, he worked as a Union Army surgeon.
He published his most important scientific work, The Solar Parallax and its Related Constants, in 1891.