What is the origin of the idiom "know which way the wind blows" and when to use it?

The idiom "know which way the wind blows" finds its roots in ancient maritime traditions. Sailors used the direction of the wind to navigate their ships effectively. Figuratively, it conveys the idea of understanding the prevailing circumstances, opinions, or trends to make informed decisions. This expression highlights the importance of being attuned to the current environment and adapting accordingly. It is often used in contexts where one needs to stay aware of changing situations or public sentiment to make decisions wisely.