Did Ptolemy Understand the Moon Illusion?

@article{Ross1976DidPU,
  title={Did Ptolemy Understand the Moon Illusion?},
  author={H. Ross and G. M. Ross},
  journal={Perception},
  year={1976},
  volume={5},
  pages={377 - 385}
}
  • H. Ross, G. M. Ross
  • Published 1976
  • Psychology, Medicine
  • Perception
  • Ptolemy is often wrongly credited with an explanation of the moon illusion based on the size-distance invariance principle. This paper elucidates the two Ptolemaic accounts: one in the Almagest, based on atmospheric refraction, and the other in the Optics, based on the difficulty of looking upwards. It is the latter passage which has been thought to refer to size-distance invariance, but it is more probable that it refers to the idea that the visual rays are diminished by the force of gravity… CONTINUE READING
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