Interferometry is the use and analysis of superimposed Electromagnetic Radiation waves. The patterns produced by waves from slightly different directions or Wavelengths include information about relative directions and wavelengths. A device carrying out this function is called an Interferometer.
Radio Astronomy makes much use of interferometry (Radio Interferometry), using multiple Radio Telescopes (dishes) to achieve a higher Angular Resolution. Keck Observatory and other twin/multiple telescopes can be used for interferometry of Visible Light (Optical Interferometry). A type of imaging Spectrograph, the Imaging Fourier Transform Spectroscopy makes use of a type of interferometry.
Electronic Very-long-baseline Interferometry (e-VLBI)
New Gravitational Wave Observatory (NGO)
Queen's University Radio Observatory (QRO)
Stellar Radius Determination
Very Large Array (VLA)
Very-long-baseline Interferometry (VLBI)