Aristarchus of Samos - Eye Quotes

5 Sourced Quotes

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When the sun is totally eclipsed, the sun and the moon are then comprehended by one and the same cone which has its vertex at our eye.
Proposition 8

Aristarchus of Samos
When the moon appears to us halved, the great circle parallel to the circle which divides the dark and the bright portions in the moon is then in the direction of our eye; that is to say, the great circle parallel to the dividing circle and our eye are in one plane.
Proposition 5

Aristarchus of Samos
Hypotheses

1. That the Moon receives its light from the sun.
2. That the earth is in the relation of a point and centre to the sphere in which the moon moves.
3. That, when the moon appears to us halved, the great circle which divides the dark and the bright portions of the moon is in the direction of our eye.
4. That, when the moon appears to us halved, its distance from the sun is then less than a quadrant by one-thirtieth of a quadrant.
5. That the breadth of the (earth's) shadow is (that) of two moons.
6. That the moon subtends one fifteenth part of a sign of the zodiac.

Aristarchus of Samos
The diameter of the moon is less than 2/45ths, but greater than 1/30th of the distance of the centre of the moon from our eye.
Proposition 11

Aristarchus of Samos
The circle in the moon which divides the dark and the bright portions is least when the cone comprehending both the sun and the moon has its vertex at our eye.
Proposition 3

Aristarchus of Samos