How Much Do Diamond Engagement Rings Cost. There are two major factors which contribute to the cost of a diamond: a ratings system called the âFour Csâ and whether or not the diamond is ASG/GIA certified. The Four Cs refers to the diamondâs color, cut, clarity, and carat size.
Best Answer: A wind vane is used to tell wind direction. The National Weather Service and those that have a lot of money use a Aerovane. Aerovanes are commonly used at many weather stations and airports to measure both wind direction and speed.
What is Wind Direction ? Wind direction is the direction from which the wind is blowing; the direction from which the air is moving. It is not the direction the wind is blowing toward. Wind direction is measured with reference to 360 degrees on the compass (true North), and expressed to the nearest degree, going in a clockwise direction, or to any one of the 16 points on a compass (N, S, SE, WSE, etc...).