Radial Blur

It has received several different names, according to the country where it was adopted mass radiography, miniature chest radiograph (United Kingdom and USA), roentgenfluorography (Germany), radiophotography (France), schermografia (Italy), photoradioscopy (Spain) and photofluorography (Sweden).

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Per Soter, two bodies are defined to share an orbital zone if their orbits cross a common radial distance from the primary, and their non resonant periods differ by less than an order of magnitude.