Cloud cover such as the Amazon Rainforest and some others are almost always clear such as the Sahara Desert. Cloud cover Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places. The global cloud cover averages around 0.68 when analyzing clouds with optical depth larger than 0.1. This
Yoke (unit of measurement) land between the chalk ridges of the North and South Downs, was covered in ancient broadleaf forest but there are indications that much of what is now Penshurst had been cultivated clearings since Roman days. The Romans left no tangible relics although we have a record of their measurement for land in the "Yokes" of Chested, Vexour, Chafford etc. The yoke is the old Roman "jugerum", about 25 ares or 0.625 acres. This word has survived only in Kent. One theory is that the Jutes conquered Kent, whereas the Angles and Saxons (c 450 AD) settled over the remainder of