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Angle of vision 450
HORIZON SEEMS ROUND, WHY?
Moreover our eyes are so contrived that objects beyond the ken of vision will appear circular; e.g. if we cast a far off glance around us, we will find the line of horizon meeting the earth. If we go on the terrace of a tall building or climb mountain-tops we find the sky meeting the earth on all sides in the circular line of the horizon. That is the earth appears round viewing from the sky. (See fig. on page 45)
Also according to our knowledge of the modern geometry our eyes form an angle of 45° on all sides. That is why we see the horizon on all sides in the shape of a dome. But in fact this is an optic illusion.
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