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Informations
Formula for distance-calculations - Detailed explanation of the formula used to calculate the distance between two coordinates on earth.
Data of the earth - The most characteristic and asked for data of the earth
Model of coordinates - How does the model work? What has Greenwich, UK to do with it? Answers to the models of coordinates can be found here.
History of Zipcode - Historical overview of the German zipcodes and the changes in the system
History of koordinaten.de - From the beginning to today
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