Without fanfare, astronomers have redefined one of the most important distances in the Solar System. The astronomical unit (au) — the rough distance from the Earth to the Sun — has been transformed ...

Appearances aside, the stars are not eternal and the planets do not move with clockwork precision. For these reasons, one astronomer is proposing that his colleagues ditch the astronomical unit, or AU ...

The AU - based on the distance between Earth and the sun - has long been in use by astronomers, and the decision by the International Astronomical Union (IAU) simply ...

If you guessed the astronomical unit, you are correct. The au — the rough distance between the Earth and the Sun — was previously determined by a confusing calculation (“the radius of an unperturbed ...

THE solar constant of the Earth is the extraterrestrial flux of the Sun's energetic radiation integrated over all emission wavelengths and referred to one astronomical unit (AU). An accurate knowledge ...