Prior to computer technology, how did astronomers so precisely predict solar eclipses? Kurt PetersenSheboygan Falls, WI What a wonderful question! The simple answer is that they relied on centuries of ...

Ibn-al-shatir's lunar model from which Copernicus is reported to have borrowed in composing his cosmological model. Credit: https://www.ccvalg.pt/astronomia/historia ...

Before telescopes, ancient Greek astronomers relied on naked-eye observations of the night sky to understand the universe around them. The meticulous star catalog belonging to one of the best of these ...

A piece of thousand-year-old parchment is finally giving up its secrets. In a major breakthrough this week, researchers at the SLAC National Accelerator Laboratory in Menlo Park used X-ray beams to ...

What a wonderful question! The simple answer is that they relied on centuries of previous observations. Remember, even computers have to be programmed with the right data to produce future times of ...