Whow, there is something to be learned everywhere.
There is this somewhat simple game call #Ingress
, which is mainly about drawing triangles on maps. And then someone comes up with below "triangle".
Well, doesn't look like a triangle? (Edit: the blue shaded one) No, Niantics Ingress programmers didn't go wrong. Actually it is a perfect triangle of geodetic lines between three points, covering North Pole. Geodetic lines are shortest connections between points on our planet Earth
We really need to learn how strange the features of map projections, i.e. flattening Earth to a map, become, when taken to large scale.
If you want to toy around with #geodetic
lines yourself. Here is a nice website for some experiments:http://geographiclib.sourceforge.net/scripts/geod-google.html
You need to be familiar with the most common way to express coordinates on earth, some #geocaching
will help you to get there. To start with some approximation of one of the arcs in the image paste "65°19'N 53°49'E 46°58'N 62°30'W" in the inbox next to it and press the "inverse" button.
Sidenote: I though I live way south from cold Canada, but actually I live quite a bit north of that one anchor point. Thank you gulf stream, we have a milder climate over here.
(Ingress post via +Anne Miles