https://www.streetdirectory.com/etoday/video/epepuf/what-is-apparent-magnitude-video.html
What Is Apparent Magnitude Video
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https://www.wolframalpha.com/input?i=NGC+7662+apparent+magnitude
NGC 7662 apparent magnitude - Wolfram|Alpha
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https://everything2.com/title/apparent+magnitude
Apparent magnitude
The convention of apparent magnitude is based on a system devised in ancient Greece by the astronomer Hipparchus (160-127 BC). The Greeks classified stars...
apparentmagnitude