what do you mean by direct and indirect methods of measurement of length ? give examples tooooo

Direct method of measurements are used for measuring short distances with the help of metre scale, screw guage, vernier calliper. Eg. measuring the length of the paper. Indirect method of measurements are used for measuring long distances with the help of parks method ,Copernicus method. eg. measuring the b/w earth and sun .

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With the help of parallax method not parks method. (Indirect method ).
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