Any gyroscope, motion of stars in southern hemisphere, radar VHF UHF transmission, gravity is less at equator. eclipses, transit of Venus, speed of light, orbital periods of outer planet satellites vary over a 12 month period, seismic records, true distance from South America to Australia. over the horizon radar, Doppler shift, all space shots, Coriolis, inertial navigation, celestial navigation, 24 hour sunlight at poles. the moon's orbit is an ellipse, gravity on other planets is more or less, Coriolis don't work at equator, large area surveying, basic trig, the south pole is real, weather, stellar aberration.
And septic.