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.
wind observations are measured in two ways wind speed and wind direction where possible measuring devices should be in a large open area away from possible interference such as building trees etcind speed and wind direction where possible measuring devices should be in a large open area away from possible interference such as building trees etc