Alvan Clark
An artist turned master optician, his hand-ground lenses revealed the universe's hidden stars and planets for the first time.
1804–1887 (age 83)·American astronomer and telescope maker·Birthday: March 8
Biography
Alvan Clark began his professional life not among the stars, but as a portrait painter in Boston. His shift to telescope making in his forties was driven by a fascination with optics and a meticulous, artistic eye. He founded Alvan Clark & Sons with his children, a family workshop that became the world's premier source for astronomical refractors. Their instruments, crafted with an almost obsessive attention to detail, were not just tools but works of art that defined an era of discovery. Clark's lenses, the largest and sharpest of their time, equipped the great observatories of America and Europe, enabling the first visual detection of Sirius's faint companion star and expanding the known boundaries of the solar system. His legacy is etched in glass, having literally shaped how humanity saw the cosmos in the 19th century.
#1 When Alvan Was Born
The biggest hits of 1804
Alvan's Life & Times
The world at every milestone
1804Born
1809Started school
1817Became a teenager
1820Could drive
1822Could vote
1825Turned 21
1834Turned 30
1844Turned 40
1854Turned 50
1864Turned 60
President: Abraham Lincoln
1874Turned 70
President: Ulysses S. Grant
1884Turned 80
President: Chester A. Arthur
1887Died at 83
President: Grover Cleveland
Key Achievements
- Founded Alvan Clark & Sons, the leading American maker of astronomical refracting telescopes in the 19th century.
- His company produced the lenses for the 36-inch Lick Observatory refractor, the world's largest for its time.
- The Clark-built telescope at the U.S. Naval Observatory was used to discover the moons of Mars, Phobos and Deimos.
- His personal observations with his own telescopes led to the discovery of several double stars.
Did You Know?
He was originally a successful engraver and portrait painter before turning to telescope making.
He and his son Alvan Graham Clark made the first visual observation of the star Sirius B in 1862.
The Clark refractor at the Dearborn Observatory was used to save it from being moved by a rival university by literally chaining it to the floor.
He never formally trained as an optician or astronomer, learning through experimentation.
“The figure of a star is not a point but a small disk; the lens must be flawless to show it.”
