The telescopes second first light was done by video. The new 100 inch Zerodur-glass mirror arrived at La Palma in December 1982. The pointing accuracy of the telescope is around 5 arcseconds, but a sophisticated autoguider, which tracks a given guide star and makes small corrections to the telescope tracking, allows a guiding accuracy of better than an arcsecond on better than 20th magnitude guide stars in support of the typical 0.8–1.5 arcsec seeing at the INT. Contemporaries The Isaac Newton Telescope was a very large telescope for its day, and the largest in England. It was a little smaller in aperture than the 100-inch Hooker telescope in the United States, but much newer. It originally had a 98-inch mirror when in England, but was given a new, larger 100-inch mirror by Grubb Parsons after the move. 1967 The INT was inaugurated by Queen Elizabeth II in 1967. The largest optical telescopes in 1967 included: 1984 INT began its new life atop the Spanish island of La Palma in the Canary Islands in 1984, with a new mirror and dome. Large visible-light optical ground telescopes in 1984 included: HARPS3 The High Accuracy Radial velocity Planet Searcher 3 (HARPS3) is a high resolution Echelle-type spectrograph that will be installed onto the telescope and aims to start observations in 2024. It is being built as part of the Terra Hunting Experiment - a future 10 year radial velocity measurement program to discover Earth-like exoplanets. It has a goal to achieve 10 cm/s radial velocity precision. See also Isaac Newton Newton's reflector (a reflector made by Isaac Newton in the 1600s) Newtonian telescope (a telescope design) International Year of Astronomy commemorative coin The INT Photometric H-Alpha Survey (IPHAS), an astronomical survey of the northern plane of our Galaxy by this telescope References External links INT Homepage Stock Photo of old 98 inch mirror at Herstmonceux Science Center INT article (2012) Optical telescopes Astronomical observatories in La Palma 1967 establishments in Spain