Convert from cawney to oxgang

Unit Definition (cawney)
The Cawney is a traditional unit of land area in southern India, equal to about 4/3 acre (0.54 hectare). The name is an English tranliteration of a Tamil word for the unit.

Unit Definition (oxgang)
The oxgang is an old English unit of land area equal to 1/8 hide or roughly 15 acres (6 hectares). The hide was considered the area a farmer could plow with a team of 8 oxen, so an oxgang was the area he could plow with a single ox. The unit was also called the bovate, from the Latin word bos for an ox or cow.