1) The star isn't as reliable because it changes it's brightness, and because of the earth's rotation, it moves some every year, making it at random every time.
It can be easily confused w/ other stars, because it's slightly dim.
People often use it for navigation, but contrary to poplar belief, it's a terrible way to navigate.
2) The magnitude scale is a scale that states a star's brightness from 1 - 6.
1 being the brightest, 6 being the dimmest.
Basically it shows you brightness and difference in luminosity.
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