The contribution of Giordano Bruno to the principle of relativity

TL;DR

This paper reevaluates Giordano Bruno's scientific contributions, highlighting his early anticipation of the principle of relativity and suggesting Galilei's possible awareness of Bruno's work.

Contribution

It reveals that Bruno's 1584 dialogue contained ideas similar to Galilei's relativity principle, challenging the historical view of Bruno's scientific insignificance.

Findings

Bruno's work predates Galilei's relativity metaphor

Bruno's dialogue contains early relativity concepts

Galilei may have been influenced by Bruno's ideas

Abstract

The trial and condemnation of Giordano Bruno was mainly based on arguments of philosophical and theological nature, and therefore different from Galilei's. Such elements contribute to unfairly devalue the scientific contribution of Bruno and do not properly account in particular for his contribution to physics. This paper discusses the contribution of Bruno to the principle of relativity. According to common knowledge, the special principle of relativity was first enunciated in 1632 by Galileo Galilei in his Dialogo sopra i due massimi sistemi del mondo (Dialogue concerning the two chief world systems), using the metaphor today known as "Galileo's ship": in a boat moving at constant speed, the mechanical phenomena can be described by the same laws holding on Earth. We shall show that the same metaphor and some of the examples in Galilei's book were already contained in the dialogue La cena de le Ceneri (The Ash Wednesday Supper) published by Giordano Bruno in 1584. In fact, Giordano Bruno largely anticipated the arguments of Galilei on the relativity principle. It is likely that Galilei was aware of Bruno's work, and it is possible that the young Galilei discussed with Bruno, since they both stayed in Venezia for long periods in 1592.