Heliometer

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

A heliometer (from Greek ἥλιος 'sun' and 'measure') is an instrument originally developed from the mid-eighteenth to early nineteenth centuries for measuring the variation of the Sun's diameter at different seasons of the year, but the modern version of the instrument is capable of much wider use.

Excerpt from the Wikipedia article “Heliometer”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tsui, CC BY-SA 3.0, via Wikimedia Commons.