Length measurement has been an indispensable part of human life since the ancient era till present days. Length and area measurement got importance from very early Indus Valley civilization for construction of roads to measurement of agricultural land. In India, length measurements were defined in Indus Valley civilization and rulers had rules for length measurements. Mughal and British adopted the measurement system contemporary to the international system of units available and were used in the country. During twilight years of the regime of British government, plans for setting up an institute for measurement standards were made and a national institute of measurements was founded in 1942. Within the first decade of laying the constitution of India, SI units were adopted. In this paper, we describe the history and advancements in the progress towards length measurement through its various redefinitions from time to time. It covers the evolution of SI unit of length “Metre” through its diversified redefinitions from the ages of body parts to latest quantum standards.

从古代到现在，长度测量一直是人类生活中不可或缺的一部分。从很早的印度河谷文明建设道路到测量农地，长度和面积的测量就变得很重要。在印度，长度测量是在印度河流域文明中定义的，统治者有长度测量的规则。莫卧儿（Mughal）和英国人（British）采用了国际上现有的并已在该国使用的计量系统。在英国政府执政的暮年中，制定了建立测量标准研究所的计划，并于1942年成立了国家测量研究所。在印度宪法成立的最初十年内，采用了SI单位。在本文中，我们通过不时进行各种重新定义来描述长度测量的历史和进展。它通过从身体部位的年龄到最新的量子标准的多样化重新定义，涵盖了SI长度“ Metre”的演变。