ntimeters using corrections for factors like wave height and air pressure. If you compute the orbit of the... atellite accurately you can measure the sea level height. Combine all the measurements over the world's oceans and you get a global map of sea surface heights. Local sea surface height is affected by local gravity and ocean currents. The local gravity effects ten
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ad to make a number of
predictions, including the height of the sun on a given date. Height
was measured with a gnomon. A gnomon is a type of sundial that is only
