WHEN Ole Romer determined that light has a finite speed it was 1676.
Putting the year in perspective, it was 10 years after the Great Fire of London and 11 years after the plague.
Christopher Wren was at the top of his game and the American colonies were discovering that land already occupied can't be taken without a fight. Romer did try to measure light's speed and came up with a figure not too far from accurate.
The Danish astronomer arrived at about 220,000,000 metres per second - actual speed is 299,792,458 m/s. Many refused to believe his findings, 340 years ago, preferring to stick to what was blindingly obvious. Light speed is instant.
Nowadays we are more enlightened and know that only one thing can travel instantaneously, and that is gossip and conjecture fired from a social media cannon, a gun capable of firing a projectile much faster than mainstream media artillery.