Today, a planetary prodigy. The University of Houston's College of Engineering
presents this series about the machines that make our civilization
run, and the people whose ingenuity created them.
Jeremiah Horrocks got a new telescope in 1638. That was
thirty years after the Dutch had made the first telescope. Horrocks was twenty,
and had already been doing astronomy with a more primitive instrument. Now he
had a good one and was about to earn his name as the Father of British
Astronomy. The catch is, he would also die three years later at the age
of only 23.
Like another astronomer, Omar Khayyam, Horrocks was also a poet. And he used
poetry to sing his telescope's praises:
Divine the hand which to Urania's power
Triumphant raised the trophy, which on man
Hath first bestowed the wondrous tube by art
Invented, and in noble daring taught
His mortal eyes to scan the furthest heavens.
By then, Horrocks knew Kepler's and Copernicus's work intimately. Galileo had
only recently finished his Dialogue Concerning the Two Chief World Systems
and Horrocks probably had yet to read it.
He was born and would die near Liverpool. He'd studied for a few years at Cambridge,
but, at seventeen, came home to study astronomy. England was then far from the
intellectual centers of Europe, and he had little access to the leading science
of the day.
Horrocks's first triumph with his new telescope came a year later. He'd predicted
the orbit of Venus. Now he and a friend set out to verify it. They made the first
observation of the transit of Venus -- its passage across the face of the sun.
To do that, they had to let the telescope project its view on a screen in a
Horrocks's religious leanings were Puritan and intense. But he had no trouble
opposing Catholic teachings about a Ptolemaic Earth-centered universe. His
poetry about it was scathing:
Why should'st thou try, O Ptolemy, to pass
Thy narrow-bounded world for aught divine?
And so he gained an amazing understanding of the solar system. He calculated that
the sun is sixty million miles from Earth. That offended other astronomers who
thought it was much closer. We now know that it's still further -- over ninety
million miles away. He formed a rudimentary concept of gravitational forces. He
understood that comet orbits are elliptical. Horricks's Law said that all
the then-known planets would appear the same size, if viewed from the sun. Not
true for Mars or Saturn; but otherwise very accurate.
So history leaves its what-if questions: What might Mozart or Schubert
have written at the age of sixty? What if Evariste Galois, who set the foundations
of modern algebra, had lived beyond the age of nineteen? Would Jeremiah Horrocks
have eclipsed Newton who followed, two generations later? That question obviously
touched Horrocks's 19th-century biographer A. B. Whatton, who left his own florid
lines of Victorian verse:
That meteor-life, soon lost to vision here,
Now shines unclouded in a glorious sphere;
Yet here its light his bright example gives,
And here in fame undying Horrox lives.
I'm John Lienhard, at the University of Houston,
where we're interested in the way inventive minds
W. Applebaum, Horrocks, Jeremiah. Dictionary of Scientific Biography,
C.C. Gilespie, ed. Vol. VI (New York: Charles Scribner's Sons, 1972): pp. 514-516.
P. Aughton, The Transit of Venus: The Brief, Brilliant Life of Jeremiah Horrocks,
Father of British Astronomy. (London: Weidenfeld & Nicolson, 2004).
See also: http://en.wikipedia.org/wiki/Jeremiah_Horrocks
An imagined image of Horrocks observing the transit of Venus
(Public domain, courtesy of Wikipedia)
The Engines of Our Ingenuity is
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