west longitude

基本解释

You are between 40 and 41 degrees north latitude and between 59 and 60 degrees west longitude.
你在北纬40-41度之间，西经59-60度之间。
The distance to Io was 2.5 million kilometers (1.5 million miles) and the image is centered at 85 degrees west longitude.
当时距木卫一250万千米，图像中心对准的是西经85度。
www.astronomy.com.cn
I showed him if you trace down the 120-degree west line of longitude — which runs almost directly through Reno, Nev. — you end up in the Pacific Ocean, somewhere west of Los Angeles.
我指给他看，如果沿着120度西经，会直接经过内华达西面的，在太平洋的边上就是洛杉矶。

So each hour's time difference between the ship and the starting point marks a ship's progress of fifteen degrees of longitude to the east or west.