As the target follows its apparent path on the celestial sphere, the interferometric baselines, seen from the point of view of the target do shrink and rotate. As time goes, the uv coverage evolves, and draws what are known as uv-tracks.
For this simulation, the free parameters are: the average latitude of the interferometer, the declination of the target and the total range of hour angle, centered on the time at transit.
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Resulting uv-coverage |