On the terrestrial globe in the construction, there are two points, one orange and one green. The points of the same color on the Mercator map are their projections. You can choose the position of both points. If you want precision when using the sliders, use the [b]arrow keys[/b] on your keyboard. There are six interconnected modes to choose the position:[br][list][*]Enter their [b]coordinates [/b]with the lower (E-W longitude) and right (N-S latitude) slider. Keep in mind that some latitudes may fall outside the limits of the Mercator map. To get the coordinates of a specific location, search for it in google maps.[/*][*]Move the upper slider, which scrolls through a list of [b]cities [/b]ordered by country. The point will occupy the position of the chosen city.[/*][*]Move the point directly on the Mercator [b]map[/b]. Use the longitude and latitude sliders to fine-tune the precision.[/*][*]By directly moving either of the points, either on the globe or on the map, the corresponding text will display the nearest population from the list of cities. Click on that [b]text [/b]to choose that city.[br][/*][*]Activate one of the three [b]checkboxes [/b]with predefined routes. In this case, the information for the country and precise location will appear.[br][/*][/list]RHUMB LINE. This construction will help you interpret straight lines in spherical geometry. A [color=#cc0000][i]rhumb line[/i][/color] connects the two poles (or a circle if the points have the same latitude or longitude). Activate (or deactivate) the [color=#cc0000]Rhumb Line[/color], [color=#e69138]Orthodromic [/color]and [color=#1e84cc]Circular [/color]checkboxes to display (or hide) the routes, in red, yellow, and blue, respectively. Use the [color=#9900ff]violet [/color]buttons and the [color=#9900ff]violet [/color]slider (speed) to control the animation. The construction also shows the kilometers of each route and the constant value of the angle at which the rhumb line intersects the parallels (both on the Mercator map and on the earth globe).