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Senior Member
The vertical scale represents the flow of time, with time moving forward as you move down the page. Every white line represents 100 years and the scale is equidistant, which means that the distance between two lines near the top of the chart is exactly same as it is near the bottom. This is important because it allows for accurate comparisons to be made and thus gives the viewer a proper perspective on time. Horizontally, the various sections of the chart represent different parts of the world.
Source: YouTube - Timeline of World History | Major Time Periods & Ages

What is the difference if I say parts here?
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  • Uncle Jack

    Senior Member
    British English
    You could use "parts". Without seeing the chart, it is difficult to say which is best, but "part" is generally used for things that make up a whole. From the text, there does not really seem to be a whole, as such, and each section is independent of the others.
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