Great and small circles
For many topics in physical geograohycal,the earth can be trated as if it were a true sphere.
For example,flattening of the pols can disregarded to simplify an understanding of the impotant concept of the earth as an turning under sun`s rays.
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کمال خدایی فر ::: شنبه 87/5/12::: ساعت 1:55 عصر
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