The Ujjain Observatory, located in Madhya Pradesh, is considered to be the oldest astronomical observatory in India, dating back to the 5th century BCE.

The Kodaikanal Solar Observatory in Tamil Nadu is dedicated to the study of the Sun and its various phenomena, including sunspots, solar flares, and coronal activity.

The GMRT, located in Maharashtra, is a radio telescope consisting of 30 fully steerable parabolic radio antennas, making it one of the world's largest radio telescopes.

The Tata Institute of Fundamental Research in Mumbai houses the Gamma-Ray Astronomy Group, which is actively involved in the study of gamma-ray sources and high-energy astrophysics.

The Vainu Bappu Observatory in Tamil Nadu primarily focuses on optical astronomy, utilizing telescopes to study celestial objects in visible light.

The Indian Institute of Astrophysics in Bengaluru houses the Infrared Astronomy Group, which is dedicated to the study of infrared radiation from celestial objects.

The Jantar Mantar observatories, located in Delhi and Jaipur, are renowned for their large stone structures, such as the Samrat Yantra and the Jai Prakash Yantra, which were used for astronomical observations and timekeeping.

The Laser Interferometer Gravitational-Wave Observatory (LIGO) has a facility in India, located in Hingoli, Maharashtra, which is part of the global network of LIGO detectors used to detect and study gravitational waves.

The Aryabhatta Research Institute of Observational Sciences in Uttarakhand primarily focuses on optical astronomy, utilizing telescopes to study celestial objects in visible light.

The Tata Institute of Fundamental Research in Mumbai houses the X-ray Astronomy Group, which is actively involved in the study of X-ray sources and high-energy astrophysics.

The Devasthal Optical Telescope (DOT) is located at a high altitude in the Himalayas, providing excellent atmospheric conditions for astronomical observations with minimal interference from light pollution and atmospheric turbulence.

The Tata Institute of Fundamental Research in Mumbai houses the Cosmic Ray Group, which is actively involved in the study of cosmic rays and their interactions with the Earth's atmosphere.

The Inter-University Centre for Astronomy and Astrophysics in Pune primarily focuses on theoretical astrophysics, conducting research in areas such as cosmology, gravitation, and astroparticle physics.

The Tata Institute of Fundamental Research in Mumbai houses the Neutrino Group, which is actively involved in the study of neutrinos and their properties, including neutrino oscillations and neutrino mass.