by using the position on the sky and the redshift to determine a distance along the line of sight
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by using the position on the sky and the redshift to determine a distance along the line of sight
You can learn how to get to somewhere using road maps,museum maps,and etc.
A set of measurements is taken of a physical object or space, and the measurements uniformly reduced by a large factor, to create a model or chart in a smaller, more usable form. e.g. Scale models of buildings, terrain maps.
Maps.
Maps covering a large area suffer from "barrel distortion". In the usual layout of maps, East-West distances are compressed near the equator and exaggerated as you move towards the poles.