The Man Who Caught the Rainbow: The Forgotten Story of the Persian Mathematician Who Solved One of Nature's Greatest Mysteries - Softcover

Inhaltsangabe

For fifteen hundred years, nobody could explain the rainbow.

You have seen a hundred of them. You have probably never been told why the colours come in that order, or why the arc always sits at the same height in the sky, or why there is sometimes a second, fainter bow above the first with its colours running backwards. Almost nobody has. The most public mystery in the natural world hangs over every field after every storm, and most of us have quietly agreed not to ask.

Aristotle asked, and got it wrong. Ibn Sina asked, and got it wrong. In thirteenth-century England, two of the finest minds in Christendom asked, and got it wrong.

Then, in a darkened room in the Persian city of Tabriz, around the year 1309, a mathematician named Kamal al-Din al-Farisi covered his window, left a single slot for the sun, and set a glass sphere full of water in the beam. He had built a raindrop he could hold still. Over years of patient work he traced what the light did inside it — and worked out, correctly and completely, why the sky makes rainbows.

Then history lost him for six hundred years.

This is a narrative biography of that man and that room, written for readers who have never opened a physics book. It is the story of a brilliant, cosmopolitan, dangerous world — Mongol khans, a vizier executed at eighty, a city of silk and scholars — and of one person inside it who gave his life to a single question nobody was paying him to ask.

• Understand exactly how a rainbow works, in plain language, with no mathematics required
• Meet the forgotten Persian scholar whose answer arrived more than three centuries before Descartes and nearly four before Newton
• Watch a manuscript survive seven hundred years of war, damp and indifference to surface at auction in London in 2018
• Discover why a Dominican friar in Germany reached the identical answer in the same decade, and what that proves about how truth travels
• Sit with the quiet, difficult question underneath it all: does careful work still count when no one is watching you do it

This is a book for anyone who has ever poured years into something the world never noticed.

The empire that funded him is gone. The city was sacked. The angle he measured has not moved.

Open the first page. He has been waiting a long time.

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