http://www.pearltrees.com/mattharmon/maps-and-natural-systems/id11705040/item132631136
https://www.amazon.com/Magnete-William-Gilbert/dp/048626761X
https://www.lancaster.ac.uk/fass/projects/gilbert/works/demagnete.htm
https://en.wikipedia.org/wiki/De_Magnete
https://www.thoughtco.com/degree-of-latitude-and-longitude-distance-4070616
"What is the precise location of Los Angeles? It can be stated in relative terms (about 3,000 miles west of New York, for example), but for a cartographer, pilot, geologist, or geographer, a much more specific measurement is needed. In order to precisely locate any spot in the world, therefore, we use a geographic coordinate system that is measured in degrees of latitude and longitude. This system starts with an imaginary grid of lines that cover the entire planet. Locations are measured based on both X and Y coordinates within the grid. Because the Earth is round (sphere), however, the distances between lines on the grid vary.
Defining Latitude and Longitude
Longitude is defined as imaginary lines called meridians that run from the north to the south pole. There are a total of 360 meridians. The Prime Meridian runs through the Greenwich Observatory in England, the location agreed upon by a conference in 1884 to be 0 degrees. On the opposite side of the Earth is the international date line at approximately 180 degrees longitude, though the date line does not follow an exact straight line. (This keeps countries from being in different days.) When a person crosses the international date line traveling from west to east, they move up one day. They move back one day when traveling east to west.
Latitude is defined as imaginary lines called parallels because they are parallel to the equator and to one another. The equator, which runs in a circle around the center of the Earth, divides the planet into north and south hemispheres.
Lines of latitude and longitude intersect, creating a grid that allows anyone in any location to pinpoint a geographic location. There are 360 degrees of longitude (because meridians make Great Circles around the globe), and there are 180 degrees of latitude. To further specify exactly where to find anything on Earth, measurements are stated not only in degrees but also in minutes and seconds. Each degree can be broken into 60 minutes, and each minute can be divided into 60 seconds. Any given location can be described in terms of degrees, minutes, and seconds of longitude and latitude.
What Is the Distance Between Degrees of Latitude?
Degrees of latitude are parallel so, for the most part, the distance between each degree remains constant. However, the Earth is slightly elliptical in shape and that creates a small variation between the degrees as we work our way from the equator to the north and south poles."
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https://medium.com/@caserobertson/latitude-and-longitude-explained-65719a7fc97d
https://www.quora.com/How-do-I-find-the-circumference-of-the-latitude-70-degrees-south
"Think of a triangle joining the centre of the earth, a point on the earth on the 70 degree latitude, with one line along the plane at 70 degrees, and another at right angles to the plane passing through the pole. So you have the length of the hypotenuse - the radius of the earth and that adjacent divided by the hypotenuse is cos 70 degrees. So you easily work out the adjacent length, Then use 2 pi * adjacent."
