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Astronomical question and answer 223

 

Frank L. Preuss

 

How can one do simple astronomical angle measurements?

 

Today I have observed the setting of the full-moon. I then opened one window so far that the window pane was perpendicular to the direction to the moon and then I took a standard lamp and took a sight on the moon via the highest point of the standard lamp and marked the direction on the window pane. I did this four times, every 5 minutes, and had a line, which had the same angle to the vertical as the degree of the latitude on which I was. I then measured the angle between moonset and west direction, and it agreed with that of the astronomical table. And then I went outside the door and saw the rising sun; it was opposite that place where the moon had set.

The astronomical tables also show that the places, where the sun rises and sets, differ from one day to the next day by less than one degree, but those of the moon by several degrees.

 

This is the end of "Astronomical question and answer 223"
To the German version of this chapter: Astronomische Frage und Antwort 223

 

 

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