John Couch Adams

John Couch Adams was a British mathematician and astronomer. He was born on June 5, 1819, in Laneast, near Launceston, Cornwall, and passed away in Cambridge on January 21, 1892.

Adams is best known for predicting the existence and position of the planet Neptune using only math. He did this to explain strange movements in the orbit of Uranus. Another scientist, Urbain Le Verrier, was also working on this. Le Verrier shared his ideas, and Neptune was found very close to where he predicted it would be.

Adams also helped explain why we have meteor showers. His ideas are still used today. He taught at the University of Cambridge and received many honors for his work. A crater on the Moon and some parts of space are named after him.

Early life

John Couch Adams was born at Lidcot, a farm at Laneast, near Launceston, Cornwall. He was the oldest of seven children. His parents were Thomas Adams, a poor tenant farmer, and his wife, Tabitha Knill Grylls. The family were devout Wesleyans and liked music. John loved reading books about stars and space when he was young.

John went to school in Laneast where he learned some Greek and algebra. When he was twelve, he went to a private school in Devonport. There, he studied many subjects but mostly taught himself mathematics by reading books. In 1835, he saw Halley's Comet from Landulph and started doing his own star calculations. In 1836, his mother inherited some land, and his parents sent him to the University of Cambridge. He graduated in 1843 with top honors.

Discovery of Neptune

Main article: Discovery of Neptune

In 1821, Alexis Bouvard made tables showing where the planet Uranus should be, using Newton's laws of motion. But Uranus moved differently than expected. This made Bouvard think another object might be affecting it.

John Couch Adams heard about this and thought he could find the hidden object using math and gravity. Adams worked on this for years, even while studying and helping others. In 1845, he shared his ideas with some astronomers, but he didn’t finish explaining everything clearly.

At the same time, another astronomer named Urbain Le Verrier in France was also working on this problem. Soon, the planet Neptune was found. Both Adams and Le Verrier were praised for their smart work, even though Le Verrier’s work helped find the planet first. Adams was happy to share credit and didn’t feel upset.

Work style

John Couch Adams had a special way of working. After 1852, he joined Pembroke College, where he stayed for the rest of his life. He became famous for discovering the planet Neptune using math. He also did important work on gravity and Earth's magnetism. Adams was very good at making precise calculations and often improved the work of others.

Adams did not like to compete or share his work until it was perfect. He also found it hard to write letters or remember everyday tasks. In 1852, he made better tables for measuring the Moon's distance, improving earlier work by other scientists. He hoped this would help him get a new job, but another person was chosen instead.

Lunar theory – Secular acceleration of the Moon

For a long time, people thought the Moon moved at a steady speed in the sky. In 1695, Edmond Halley suggested that the Moon was moving faster over time.

John Couch Adams studied this idea in 1853. He discovered that earlier scientists had missed some important details. Adams showed that small forces, added up over time, could change the Moon's motion. After some discussion, other scientists agreed with Adams. His work helped us learn more about the Moon's movement. For his important contributions, Adams received the Gold Medal of the Royal Astronomical Society in 1866. We now know that the Moon's changing speed is due to tidal acceleration.

Leonids

In November 1866, a big meteor shower caught the attention of John Couch Adams because of the Leonids. A scientist named Hubert Anson Newton had already talked about when and where this shower might happen. Adams studied this and found that the Leonids, a group of shooting stars in our Solar System, follow a special path in the sky every 33.25 years. He also learned that big planets like Jupiter, Saturn, and Uranus change this path a little. He shared these ideas in 1867. Some think this was his biggest success because his path for the Leonids matched the path of the comet 55P/Tempel-Tuttle, showing that comets and meteors are closely related.

Later career

Ten years later, George William Hill shared a new way to study the movement of the moon. Adams talked about his own work on the same topic, which added to Hill’s ideas.

For forty years, Adams worked on figuring out numbers in Carl Friedrich Gauss’s theory of terrestrial magnetism. These calculations were very hard and were not published while he was alive. They were put together by his brother, William Grylls Adams, and are in the second volume of his collected Scientific Papers.

Adams really admired Newton and his work. In 1872, Isaac Newton Wallop, the 5th Earl of Portsmouth, gave his private collection of Newton’s papers to Cambridge University. Adams and G. G. Stokes organized these papers and published a list of them in 1888.

In 1881, he was offered the job of Astronomer Royal, but he chose to keep teaching and researching in Cambridge. He was the British representative at the International Meridian Conference in Washington in 1884. He also went to meetings of the British Association in Montreal and the American Association in Philadelphia.

Honours

In 1847, John Couch Adams was offered a special honor by Queen Victoria, but he decided not to accept it. In 1848, he received the Copley medal from the Royal Society and the Adams Prize, a math award. He joined the Royal Society of London and the Royal Society of Edinburgh in 1849. He served as President of the Royal Astronomical Society in 1851 and again in 1874. He also became an honorary member of the American Academy of Arts and Sciences in 1847.

Family and death

John Couch Adams died after a long illness on 21 January 1892 in Cambridge. He was buried near his home in St Giles Cemetery, now called the Parish of the Ascension Burial Ground in Cambridge. In 1863, he married Miss Eliza Bruce from Dublin, and she lived until 1919. She was buried with him. Adams left behind money worth £32,434 at the time.

Memorials

John Couch Adams was honored in several ways after his death. There is a memorial in Westminster Abbey with a portrait medallion made by Albert Bruce-Joy. St John's College, Cambridge has a bust of him made by Joy. The Royal Astronomical Society also has a bust. There are portraits of Adams by Hubert von Herkomer in Pembroke College and by Paul Raphael Montord in St John's.

A memorial tablet with an inscription can be found in Truro Cathedral. A public institute was built in his honor in Launceston, near where he was born. Additionally, a place called Adams Nunatak on Neptune Glacier in Alexander Island, Antarctica, is named after him. There is also a statue in Albert Square, Manchester.

Obituaries

Several newspapers and journals wrote about Adams after his death. The Times published an obituary. The Monthly Notices of the Royal Astronomical Society and The Observatory also had articles about his contributions to science.

About Adams and the discovery of Neptune

Many books and articles have been written about Adams and his role in discovering the planet Neptune. These works talk about the history and importance of this discovery in astronomy.

By Adams

Adams wrote many scientific papers. Some of his works were collected and published after his death. His papers related to the discovery of Neptune were given to St John's College library. They were later moved to the Royal Greenwich Observatory. They were stolen during World War II but were found again in 1998.