C stands for celeritas, = swiftness in Latin.
From Io’s orbit around Jupiter, Cassini’s student Ole Roemer, a Dane, challenged him to predict Io’s reappearance after being behind the planet in 1676.
Cassini said 5;27, Roemer said 5.37 and was correct. T was to do with the extra distance the light had to travel because the earth was now on the on the further side of the sun. His speed of light calculation was accurate, but all scientists in those days thought light was instantaneous
670000000mph, London-LA in 1/20 second/ Mach 1 speed of sound, space shuttle mach 20, asteroid mach 70, light is mach 900,000!
Faraday 1821 found that electricity can be changed to magnetism and vice versa
Einstein Light waves – electrical and magnetic, driving each other forward. Light can only exist when a light wave is actively moving forward. It’s a quick leap frogging of electricity out of magnetism – its speed is the upper limit.
Protons moving close to the speed of light swell to become 2 units of mass each- then at speeds of 99.9997% of c the protons are 430X bigger than their original size, because E can become m and vice-versa , so c is a conversion factor telling how the linkage operates.
Sum of mass and energy always is constant – but why c2??
P 65 Emilie du Chatelet E=mv2, lover of Francois-Marie Arouet, aka Voltaire used work from Willem sGravesands who dropped balls into clay and found distance squared when height doubled.
When you move 2x as close to a light the brightness increases by 4x. Accelerate a car by 4x stopping distance increases 16x.
Mass is simple the ultimate type of condensed or concentrated energy – a small mass is therefore a lot of energy as c2 = 448,900,000,000,000,000.
Cecilia Payne 1923 –sun is made of H and He through spectroscope analysis. The old guard was wrong, they read the spectroscopes as reading iron but could not understand why. Payne beat rampant sexism and proved her professors wrong
Subrahmanyan Chandrasekhar (Chandra) at 19 years old in 1930 BLACK HOLES because of E=mc2. Time will finish in 1X10(34) years.