| That was one astronomical unit, equal to about ninety-three million miles, the distance from Earth to the sun. |
| We propose to two observers located on two different sites to calculate themselves the astronomical unit using their own observations. |
| Because the relative distances to the planets were well known, a definitive astronomical unit allowed the actual distances to be calculated. |
| Today the distance between the Earth and sun, known as an astronomical unit, is accurately measured by radar. |
| We are, so to speak, an astronomical unit, and we affect each other for better or for worse. |
| These spectroscopic binary stars are generally much closer to each other than visual binaries, as close as a few hundredths of an astronomical unit. |
