Going Around In Great Circles

Watts Up With That?

Guest Post by Willis Eschenbach

I’m sure many people know this, but a “great circle” is a circle that goes clear around the entire globe, and whose center is at the center of the globe. A “meridian”, on the other hand, is a great circle that passes through the poles. Lines of longitude are meridians, for example, while the Equator is a great circle. And the “Prime Meridian” is the line of longitude that goes through both poles .. and right through the Greenwich Observatory.

On the other side of the planet from where I am now, the Prime Meridian is called the “International Date Line”. Inter alia, it runs through the island of Taveuni. And I’ve stood there in Taveuni astride the Date Line, with one foot in yesterday and one foot in today.

So it was with great satisfaction that I was able to do the same on…

View original post 1,132 more words

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s