The Equator
The Equator
epicenter
it is different in different points of the year.
They are used to locate a certain place on a map.
We have several reference points on the Earth's surface, for our convenience. The North and South Poles are a couple. The choice of Greenwich as the zero longitude, and of the International Date Line are another two. These points have no specific feature on the surface, they are decided on for the convenience of the users.
Global Positioning System
The answer is Longitude.
A two-dimensional surface on which points are plotted and located by their x and y coordinates.
A two-dimensional surface on which points are plotted and located by their x and y coordinates
The North and South Poles are indeed imaginary points on the Earths surface where the line of the axis of it's spin would pass through.
Earth's orbit is an ellipse; the Sun is at one of the ellipses focal points. (The other focal point has no astronomical significance.)
a set of points on a flat surface?