Yojana

A Yojana (Sanskrit: योजन) is a Vedic measure of distance that was used in ancient India. A Yojana is about 12–15 km. (i.e. 4 Kosh = 1 Yojana and 1 kosh is 2 - 3.5 km)

In modern Hindi the word yojanaa (Hindi: योजना) means "plan" or blueprint, and is etymologically connected with the Cartesian notion of distance in the word yojana. However, note that the words "yojana'" and "yojanaa" are different, and pronounced differently. The last sound of the second word is pronounced "aaa" as in arm [ārm].

Yojana is defined in Chapter 6 of Book 1 of the ancient vedic text “Vishnu Purana” as follows:

The length of the yojana varies depending on the different standards adopted by different Indian astronomers. In the Surya Siddhanta of the 5th century, for example, a yojana was equivalent to 8.0 km (5 mi), and the same was true for Aryabhata's Aryabhatteeya (499). However, 14th century scholar Paramesvara defined the yojana to be about 1.5 times larger, equivalent to about 13 km (8 mi).A. C. Bhaktivedanta Swami Prabhupada gives the equivalent length of a yojana as about 13 km (8 mi) throughout his translations of the Bhagavata Purana. Some other traditional Indian scholars give measurements between 6.4 km and 8 km (4–5 miles) or thereabouts. In The Ancient Geography of India, Alexander Cunningham says that a yojana is traditionally held to be between 8 and 9 miles and calculates by comparison with Chinese units of length that it could have been between 6.7 mi (10.8 km) and 8.2 mi (13.2 km).

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