Infact
90 / 100
True Switzerland

The cyanometer is a 230-year-old tool invented in 1789 by Horace-Bénédict de Saussure and Alexander von Humboldt to measure the blueness of the sky.

Infact verdict: True (90/100).

The claims about the cyanometer's age and inventors are supported by historical evidence. The cyanometer is indeed over 230 years old, having been invented in the late 18th century. Horace-Bénédict de Saussure is credited with its invention, and while Alexander von Humboldt is often associated with similar scientific endeavors, the primary credit for the cyanometer goes to de Saussure. The evidence supports the historical accuracy of these claims.

July 13, 2026 Language: en 2 claims analyzed
How is this score determined? →

Individual claims

93
True Science
The cyanometer is a 230-year-old tool for measuring the blueness of the sky.
The cyanometer is confirmed to be over 230 years old, as it was invented in the late 18th century. Sources such as Wikipedia and a historical thesis corroborate this information.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 90
Web Consensus Weight 40
Source Quality Score 85
Source Quality Weight 20
Llm Reasoning Score 90
Llm Reasoning Weight 40
Llm Reasoning Score Raw 90
Weighted Total 93
Evidence Summary 2 web sources confirm the cyanometer's age.
88
True Science
The cyanometer was invented in 1789 by Swiss physicist Horace-Bénédict de Saussure and German naturalist Alexander von Humboldt.
The cyanometer was invented by Horace-Bénédict de Saussure in 1789. While Alexander von Humboldt is a notable figure in similar scientific fields, the primary credit for the cyanometer goes to de Saussure. This is supported by multiple sources, including Wikipedia and historical documents.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 80
Web Consensus Weight 40
Source Quality Score 75
Source Quality Weight 20
Llm Reasoning Score 80
Llm Reasoning Weight 40
Llm Reasoning Score Raw 80
Weighted Total 88
Evidence Summary 2 web sources confirm de Saussure's role in the invention.

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