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Astronomical question and answer 257

 

Frank L. Preuss

 

How can one measure a distance by just blinking twice with the eyes?

 

One uses an eye distance measuring card:

AugenDistanzMessKarte2

See
Distanz
and makes his own eye distance measuring card.

 

This is the end of "Astronomical question and answer 257"
To the German version of this chapter: Astronomische Frage und Antwort 257

 

 

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