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Due to that discovery, Smith was able to recognize the order that the rocks were formed.

Sixteen years after his discovery, he published a geological map of England showing the rocks of different geologic time eras.

Also, the apparent magnitude of a celestial body may differ depending on the range of the electromagnetic spectrum in which it is being observed.

It consists of an apparent magnitude scale based on pure observation.

He classified stars based on how bright they appear in the sky.

In their investigation, the ancient astronomers needed tools to evaluate their observations, which are not commonly used on more earthly problems.

One such tool is the concept of the magnitude, which Greek astronomer Hipparchus used about 200 years ago.

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