2007-12-28 07:50:34 · 2 answers · asked by WendyB 4 in Science & Mathematics ➔ Astronomy & Space
The main definition is that given by enochiansorcerer.
In radio-astronomy, it is the action of moving the dish from one "exposure" to the next, in radio-telescopes that have multiple receivers, in order to cover the area in between each pixel.
In one exposure, you get (let us say) 11 points of data, each separated from the others by some distance. After the exposure, you aim the telescope so that the 11 detectors measure in between the points of the previous exposure, to get data points between the old ones.
Depending on how much accuracy you need, you can do this 3, 4 or even 5 times in order to really cover an area completely.
Contrary to optical astronomy and CCD cameras, the pixels in radio astronomy are so large and so widely separated that objects can easily "hide" between pixels.
2007-12-28 08:05:50 · answer #1 · answered by Raymond 7 · 0⤊ 0⤋
A tessellation or tiling of the plane is a collection of plane figures that fills the plane with no overlaps and no gaps.
2007-12-28 07:55:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋