Light Years.
To measure the distance of stars you have to measure by light years.
the time between eclipses and the average distance between the stars
The correct unit to describe the distance between stars is the "light year", the distance a photon of light would travel (through a vacuum) in a year.
the measurer
The correct answer would be 40.44.
Light years, are basically how far would does light travel, at roughly 186,000 miles a second, if it were to go for a year.
you would use kilometers.
Scientists measure light from star in light years because almost every other units would be so small compared to the distance involved between stars. in fact the nearest star (other then the sun) is 24689699219682.054 miles or 39734219301000 km.
A ruler
Km is used for long distances. As the distance between two cities.
No, they are much too far away, and you would have a number too large to be usable.
Meters