Mapping the sky

The construction of a proper map of the sky requires a more sophisticated method than the simple drawing of 100% visibility lines as in Fig. 4. These methods are a necessity if multiple point sources or extended structure are in the field of view. The process of constructing an image is called aperture synthesis, and the methods based on Fourier transforms are known as Fourier optics. Before introducing the Fourier method, we will describe a more intuitive "shading" or cross-correlation method that is an extension of the line-drawing method and also is closely related to the Fourier method. We continue to consider a two-telescope system.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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