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Kees de Jager (Cornelis de Jager) was born on 29 April, 1921 in Den Burg, Texel, Netherlands, is a Dutch astronomer (1921–2021). Discover Kees de Jager's Biography, Age, Height, Physical Stats, Dating/Affairs, Family and career updates. Learn How rich is he in this year and how he spends money? Also learn how he earned most of networth at the age of 100 years old?

Popular As Cornelis de Jager
Occupation N/A
Age 100 years old
Zodiac Sign Taurus
Born 29 April, 1921
Birthday 29 April
Birthplace Den Burg, Texel, Netherlands
Date of death 27 May, 2021
Died Place Den Burg, Texel, Netherlands
Nationality Netherlands

We recommend you to check the complete list of Famous People born on 29 April. He is a member of famous with the age 100 years old group.

Kees de Jager Height, Weight & Measurements

At 100 years old, Kees de Jager height not available right now. We will update Kees de Jager's Height, weight, Body Measurements, Eye Color, Hair Color, Shoe & Dress size soon as possible.

Physical Status
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Who Is Kees de Jager's Wife?

His wife is Doetie Rienks

Family
Parents Not Available
Wife Doetie Rienks
Sibling Not Available
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Kees de Jager Net Worth

His net worth has been growing significantly in 2023-2024. So, how much is Kees de Jager worth at the age of 100 years old? Kees de Jager’s income source is mostly from being a successful . He is from Netherlands. We have estimated Kees de Jager's net worth, money, salary, income, and assets.

Net Worth in 2024 $1 Million - $5 Million
Salary in 2024 Under Review
Net Worth in 2023 Pending
Salary in 2023 Under Review
House Not Available
Cars Not Available
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Timeline

1921

Cornelis "Kees" de Jager (29 April 1921 – 27 May 2021) was a Dutch astronomer who specialized in predicting solar variation to assess the Sun's impact on future climate.

Thus solar activity in the 21st century is expected to be lower than it was for most of the 20th century.

A reduction in solar activity means less energy input to the Earth as part of the Earth's energy budget, partially countering climate change.

De Jager postulated that solar magnetic activity is the most significant contributor to tropospheric temperatures, with polar activity also being significant, and that with the subtraction of these factors from temperatures recorded over the preceding 400 years, peaks and dips in temperature could be observed, accounting for recent increase in global warming.

1923

The track of the two components went from low to high activity around 1923.

1939

In 1939, De Jager heard Professor Minnaert speak.

De Jager said "I was so fascinated by what he said, that I decided right then and there to study Astronomy."

From 1939 to 1945, he studied mathematics, physics and astronomy at Utrecht University.

1952

On 13 October 1952, he obtained his PhD with a thesis called "The Hydrogen Spectrum of the Sun".

His supervisor was Marcel Minnaert.

De Jager died where he was born, in Den Burg (Texel), on 27 May 2021, less than a month after he became a centenarian.

De Jager did work on stars and solar physics, in relation to which he was a founding editor of the journal Solar Physics.

1960

From 1960 to 1986, de Jager was a professor at Utrecht University.

De Jager's later research focused on predicting solar variation to assess the Sun's impact on future climate.

Solar activity is usually defined by the Sun's toroidal magnetic field, the field component parallel to the solar equator.

Sunspots are one expression of this component.

De Jager introduced the poloidal field of the Sun, which connects its two poles, as a factor of possibly similar importance.

He used proxies for both components and took 19-year running averages to eliminate all effects that last only one or two solar cycles.

Next he plotted both components in a diagram, thus creating an experimental phase portrait.

1967

He was the General Secretary of the IAU from 1967 to 1973 and former director of the observatory at Utrecht.

He was a fellow with the Committee for Skeptical Inquiry and played an important role in the European skeptical movement as the first chairman of both Stichting Skepsis and the European Council of Skeptical Organisations.

Born in Den Burg on the Dutch island of Texel, de Jager spent his school years in the Dutch East Indies.

He was the General Secretary of the IAU from 1967 to 1973 and former director of the observatory at Utrecht.

1975

Similar theories have been rejected by other climate scientists as solar activity and global temperatures have diverged since 1975, with energy output from the Sun decreasing and Earth temperatures still increasing.

Additionally, warming caused exclusively by the Sun would result in an even warming throughout the atmosphere, rather than the observed cooling in the upper atmosphere and warming in the lower atmosphere associated with greenhouse gases.

1978

From 1978 onward, de Jager did noted work on the most luminous stars, known as hypergiants.

1980

In 1980, he was principal investigator of the Hard X-ray Imaging Spectrometer (HXIS) on board the Solar Maximum Mission satellite.

His work on solar flares was often done in collaboration with Zdeněk Švestka.

1981

In 1981, de Jager became a founding member of the World Cultural Council.

1987

He was the first chairman of Stichting Skepsis from 1987 to 1998, the first chairman of the European Council of Skeptical Organisations from 1994 to 2001, and was also a Committee for Skeptical Inquiry fellow.

De Jager joined his CSI peers by signing the "Deniers are not Skeptics" petition that asks the media to stop referring to climate change deniers as skeptics, with the petition stating "proper skepticism promotes scientific inquiry, critical investigation, and the use of reason in examining controversial and extraordinary claims", not "rejection of ideas without objective consideration".

1990

Expanding on a 1990 paper presentation at the International Skeptics Conference, de Jager published an article for Skeptical Inquirer where he parodies numerology.

In Adventures in Science and Cyclosophy, de Jager claims that many times pseudoscientific reasoning ignores coincidences dealing with the relationship between objects when there are unlimited data points.

He states that measurements surrounding the Great Pyramids have been used to show a relationship with astronomy.

To do so, he explains, anyone can use the law of large numbers to relate to anything one would want, to try and prove there is some connection.

As an illustration, he uses the example of his bicycle and the cosmos.

Enthusiasts in this formula have created a website that allows visitors to submit data to replicate de Jager's experiment.

1998

According to Kendrick Frazier, who attended the 1998 Second World Skeptics Congress in Heidelberg, Germany, de Jager's "dead-pan" description of how he took measurements throughout his house showing the "absurdities of those who attach great mystical significance to measurements of the Great Pyramid" had the audience "in stitches".

Apparently "his home is in an astronomical observatory, a location, he said, 'that may be very close to the cosmos and well receptive to its incredible powers.'"

2006

Around 2006 the same point has been passed in the opposite direction.