An elastic tape measure is a poor idea. Different amounts of pull will make the tape stretch different amounts, causing the same items to appear being of different sizes.
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A piece of string and a ruler or tape measure.
2.18723 yard ------------------------- A meter IS a measure of distance, the international standard unit for measuring length or distance.
I Use A Ruler For Measuring The Distance Between Blocks In A Wall Or Floor
An arc second is a measure of angular separation, not of distance. It is therefore an inappropriate unit for measuring the distance to a star.
You can measure distance with a measuring stick or tape. Otherwise, if you want to calculate it based on some other data, please clarify WHAT is given.