reference frame number lines time lines calendars thermometers maps
{"Image DocumentName": "reference frame number lines time lines calendars thermometers maps", "Image ImageDescription": "coordinate systems. A system of numbers, letter, or words to show quantities with reference to a zero point.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}