Annus mirabilis is a Latin phrase meaning "wonderful year" or "year of wonders" (or "year of miracles"). It was used originally to refer to the year 1666, but is today also used to refer to different years with events of major importance.

The beginning of the Scientific Revolution when

According to the Oxford English Dictionary, the first known written usage of the Latin phrase "Annus Mirabilis" is as the title of a poem composed by English poet John Dryden about the events of 1666. The phrase "annus mirabilis" translates as "wonderful year" or "year of miracles". In fact, the year was beset by great calamity for England (including the Great Fire of London), but Dryden chose to interpret the absence of greater disaster as miraculous intervention by God, as "666" is the Number of the Beast and the year 1666 was expected by some to be particularly disastrous.

In addition to this, the English fleet defeated a Dutch fleet in the St James' Day Battle, for a great victory at sea. (However, in 1667 the Dutch burned much of the English fleet in the raid on the Medway and Charles II was forced to sue for peace.)

Albert Einstein ( /ˈælbərt ˈaɪnstaɪn/; German: [ˈalbɐt ˈaɪnʃtaɪn] ( listen); 14 March 1879 – 18 April 1955) was a German theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics. While best known for his mass–energy equivalence formula E = mc² (which has been dubbed "the world's most famous equation"), he received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect". The latter was pivotal in establishing quantum theory within physics.

Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. He continued to deal with problems of statistical mechanics and quantum theory, which led to his explanations of particle theory and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.