1975 Event Ice thickness measured at 4776 m, Wilkes Land, Antarctica 1974 Event Nolan Ryan pitch measured at record 161.6 kph (100.4 mph) 1973 Event Tap dancer Ray Castle measured at 1440 taps/minute on BBC TV 1846 Death F. W. Bessel, measured distance to 61 Cygni, dies 1644 Birthday Olaus Romer, Denmark, 1st to accurately measured speed of light
