John Peckham Quote

Light from a concave luminous body is received most powerfully at the centre. The reason for this is that, for every point of a concave body, perpendicular rays, which are stronger than others, converge in the centre. Therefore the virtues of celestial bodies are incident most powerfully in and near the centre of the world.

Note the assumption that the heavenly sphere is concave with respect to the earth.

Light from a concave luminous body is received most powerfully at the centre. The reason for this is that, for every point of a concave body,...

Light from a concave luminous body is received most powerfully at the centre. The reason for this is that, for every point of a concave body,...

Light from a concave luminous body is received most powerfully at the centre. The reason for this is that, for every point of a concave body,...

Light from a concave luminous body is received most powerfully at the centre. The reason for this is that, for every point of a concave body,...