来自MSN16 天
Why the poles move around, and what it means to us
North is north, right? Well, yes and no. There is more than one north pole (and for that matter more than one south pole). As ...
Advnture on MSN1 年
How does a magnetic compass work? And what happens if you take it to the North Poles?
As you can imagine, this plays havoc with the needle. What is magnetic variation/declination? As well as all of this, the ...
EurekAlert!1 个月
Study challenges long-held theories on how migratory birds navigate
Research by Bangor University found that these birds, in this case, Eurasian reed warblers (Acrocephalus scirpaceus) are using only the Earth's magnetic inclination and declination to determine ...