They used pencil and paper, or their feet
light years
Some examples are kilogram, gram, and milligram.
To measure the distance of stars you have to measure by light years.
A unit of measure is a way of describing a standardized quantity of something.Some examples of units of measure you should be familiar with:Distance/LengthfeetmilesmetersMasskilogramsForcefoot-poundsnewtons
there are so many largest unit of length.The 3rd longest unit of measure for length is dam.
A kiogram is a unit to measure weight and a meter is a unit to measure length.
Light years or parsecs
impossible to answer. Acre is an area measure unit while feet is a length measure unit.
We can measure how long things are , how tall,or how far apaart they are .Those are examples of length meaasurements. The basic unit of length is meters.
The primitive unit of measure is the fundamental unit from which all other units are derived in a specific system of measurement. It serves as the basis for defining larger or smaller units within that system. Examples include the meter in the metric system and the inch in the Imperial system.
. . they are a convenient unit. Another convenient unit is the parsec.
there are many unit which measure volume .SI units that measure volume is cubic meter .