• There are several definitions of baseline in astronomy:

    • In radio astronomy a baseline is the vector connecting two radio telescopes that is used in interferometry to determine the fringe rate of a source at the nominal "phase centre" of an observation. For an interferometer with N elements there are N(N+1)/2 independent baselines. The pairs of antennae that are close together are good at measuring the large-scale structures in a source whereas the long baselines have better resolution and resolve the fine structures.

    baseline or continuum fit to spectral line data
    Example of a baseline fit to spectral line data.

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