The 19th century was a time of extensive study of the phenomena of electricity, magnetism and light. So two individuals moving in different directions would see events unfold in the same way.Įven though formally these individuals would see things in a different way – one might say that things move from left to right, whereas the other might say they move from right to left – still the fundamental description of the unfolding events would remain the same, and the laws of physics derived by these individuals would have literally the same form.īut in the 19th century, people started noticing that not everything plays accordingly to this rule. regardless of which “ inertial frame” they are in – are equivalent when it comes to their description of the world around them. They also had a very appealing property: all observers, regardless of whether they are moving or not – i.e.
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