Problems
The human eye is easily fooled, and Hipparchus's scale has had problems. For example, the human eye is more sensitive to yellow/red light than to blue, and photographic film more to blue than to yellow/red, giving different values of visual magnitude and photographic magnitude. Furthermore, many people find it counter-intuitive that a high magnitude star is dimmer than a low magnitude star.
Read more about this topic: Magnitude (astronomy)
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