Passion of the People – 1.1.10

Astronomy and Scientific Awakening in the Baroque Era

The European nobility increasingly promoted astronomy at their courts in the Baroque period (ca. mid-17^th century – 18^th century) as a sign of their culture and education. In addition, national observatories were founded, such as the Royal Greenwich Observatory or the Paris Observatory. Their main task was to provide tables for navigation, but they also carried out astronomical research. While the research of the court astronomers was bound to the personal interest of the princes, lords and kings, longer-term research traditions were able to develop at the national observatories, so that such independent observatories took on a leading role in research at the latest with the beginning of the 19th century.

At the beginning of the 17^th century, astronomers began to observe celestial bodies with the help of newly discovered optical instruments. In 1668, Isaac Newton came up with the idea of focusing light with mirrors instead of lenses made of glass – the invention of the reflecting telescope. He also succeeded in 1669 in discovering the attraction of mass (gravitation) and the first theory to explain the phenomenon of “light” as particle radiation, so that the understanding of the cosmos was slowly placed on a new basis.

The astronomy of the 18^th century is characterised above all by two major lines:

in observational astronomy, among other things, the improvement of telescopes (first achromats around 1730, large reflecting telescopes, new eyepieces, micrometers, etc.) and the construction of efficient observatories;
in theory, the development of celestial mechanics (based on Newton’s law of gravitation) and the first models of cosmology (formation of the Solar System, star clusters, structure of the Milky Way).

This led to important discoveries such as

planet Uranus, periodic comets, differential rotation of the sun;
proper motion of the Sun and nearby stars, fixed star aberration;
the first determination of the true size of the solar system by calculating the astronomical unit from a transit of Venus.

With increasingly powerful telescopes, the study of nebulous celestial objects became an important field of work. The brighter star clusters were already recognised as such. In 1718, Edmond Halley established the thesis of the proper motion of the fixed stars by comparing them with ancient star charts.

In 1728, in an unsuccessful attempt to measure a parallax of the “fixed stars”, James Bradley discovered that the position of each star fluctuates in the course of the year (aberration). This was also accepted by most of the then still numerous followers of the Tychonian world view as proof of the movement of the Earth. It also allowed the movement of light to be confirmed and the speed of light to be calculated more accurately.

In 1755, Immanuel Kant drew up the first theories about the origin of our solar system resulting purely from mechanical processes.

In 1761, several observers of the transit of Venus on 6 June detected the first extraterrestrial atmosphere.

In 1769, James Cook on Tahiti, as one of several observers of the transit of Venus on 3 June scattered around the world, participated in the most accurate determination of the distance Earth – Sun for well over a century.

Tookit

Passion of the People

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*Historic observatory* – Image by Thomas – Pixabay

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Isaac Newton – English Physicist & Formulated the Laws of Gravity