**Title**

The Twin Paradox: Why it is Required by Relativity

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**Summary**

This paper reveals that when wavelength-based observations are evaluated using a length-based perspective, that evaluation must explain changes in length and time, which Einstein does using Length Contraction and Time Dilation. It further explains that when wavelength-based observations are evaluated using a wavelength-based perspective, there are no changes in length and time, and the resulting mathematical equations yield quantitatively better results.