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# Astronomical question and answer 259

Frank L. Preuss

How can one measure oneself the distance between one’s own two eyes?

Just consider the answer to this question, before you click the following link.

There you find methods to make such a measurement.

You can also ask somebody to measure the distance of your eyes, you just do not know then, whether this person has done it correctly. To do it fairly right, this person must already with the two readings on the measuring tape move his own head by that distance to be in the fairly right alignment at the second reading, which must indeed be parallel to the first. And there are other problems. For example one cannot place the ruler directly to the object being measured, but must keep it at a certain distance away, and when then the measuring person moves his head, the ruler should indeed not move. One can oneself already detect how difficult it is to prevent the head from involuntary movements.

You can place your chin on a table, so that your head is still, then mount the ruler on eye level before the eyes, and also so that it is parallel to the eyes, and then let the other person do the measuring, but also then this person must move his head by the distance of your eyes to get from the alignment of your one eye to the alignment of the other, and there is then also already an estimation of the distance involved.

But to let the measuring be done by another person gives you the opportunity to compare the result with your own result.

This is the end of "Astronomical question and answer 259"
To the German version of this chapter: Astronomische Frage und Antwort 259

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