The Mechanics of Earth's Spin Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes and 4 seconds with respect to other distant stars. Scientists call this ...
Ancient Chinese astronomers observed a solar eclipse in 709 BCE with remarkable detail. These old records are now helping ...
"Some of our ancestors were very skilled observers." A team of international researchers say they've uncovered new data on ...