The core concepts of Classical Physics were originally developed hundreds of years ago, primarily in Europe and Great Britain. Replacing Aristotle's concepts that were derived from ordinary observations and imaginative thought experiments, Nicolaus Copernicus, Johannes Kepler, Galileo Galilei, Isaac Newton, Christiaan Huygens and others , founded the core of a new science based upon logical interpretations of the observations of actual physical experiments. The result was a system of concepts regarding matter, force, energy and time. This system, known collectively as Classical Physics, works remarkably well, even today, when it comes to predicting the outcome of Universal events.
Despite this early success, the many absolute concepts of Classical Physics, including absolute mass, absolute distance and absolute time, gave way in the early-1900s to the concepts of Relativistic Physics, including relative mass, relative distance and relative time, that were founded upon the theoretical thought experiments of H. A. Lorentz, G. F. FitzGerald, Albert A. Michelson, and Albert Einstein.
One question remains unanswered concerning the changing of the guard from classical concepts to relativistic concepts. At that time were the concepts of Classical Physics fully and correctly developed? If not, one cannot help but wonder if the correct repairs and improvements to Classical Physics are made today, will there no longer exist any need for the complex theoretical explanations of Relativistic Physics?
 The early pioneers in this emerging science were keenly aware of each other's work. For example, although he neglected to mention their names, Isaac Newton did want it known that if he saw a little farther into the workings of natural events, it was because he was able to "stand on the shoulders of giants". The first and foremost "giant" is herein accepted to be Newton's mentor and predecessor, Galileo Galilei.
Galileo also influenced the work of Christiaan Huygens who successfully constructed the first clock regulated by a pendulum after studying Galileo's earlier design. (Thanks to J.N. of Sussex, UK for this historical insight.)