Definition of "isochrone" []

• An isoline on a map or chart connecting points that have the same value of a quantity that has dimension time. (noun)
• A semicubical parabola (noun)

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• "Isochrone Maps in Google Maps - Google Maps Mania links to resources on how to create an isochrone map - i.e., a map that shows travel time from a given point by drawing lines like topographic contours - within the Google Maps environment."
• "Our proposal also includes observations of six well-studied globular and open star clusters; these observations will serve to calibrate our photometric indices, provide empirical population templates, and transform the theoretical isochrone libraries into the WFC3 filter system."
• "What we can see is a pretty narrow Doldrums crossing point - visible because of the northwards bulge of the isochrone around the Predicted Route."