Astronomical Unit
AU

Of course this was significant, as they were 1.5 astronomical units away.

The name "astronomical unit" appears first to have been used in 1903.

The astronomical unit of time is the day, defined as 86400 seconds.

The two stars are separated by at least 515 astronomical units from each other.

No human had gotten within an astronomical unit of those new lamps in space.

And the whole size of the solar system is something like forty astronomical units.

The two stars are currently separated by about 70 astronomical units.

Both stars orbit each other at an average distance of 1,200 astronomical units.

The gap between the two rings is 3 astronomical units.

From their minimum separation of 430 astronomical units, the period is at least 1,500 years, and may be much longer.