Largest land-based telescope
- Who
- Gran Telescopio Canarias (GTC)
- Where
- Spain (La Palma,Observatorio del Roque de los Muchachos (ORM),)
- When
- 24 July 2009
The largest land-based telescope is the Gran Telescopio Canarias (GTC) based on the island of La Palma in the Canary Islands. The telescope has a 10.4m primary mirror. The inauguration ceremony took place on 24 July 2009, with first observational measurements commencing with a spectrometer instrument called OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy).