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.
Winds (such as the north wind) are named for the direction they blow from so the north wind would blow from the north and a west wind would blow from the west (and to the east).n cup anemometer or wind vane, which are used to measure wind speed and indicate direction, point into the wind so they'd point north during a north wind.