Liri

The Liri (Latin Liris or Lyris, previously, Clanis; Greek: Λεῖρις) is one of the principal rivers of central Italy, flowing into the Tyrrhenian Sea a little below Minturno under the name Garigliano.

Source and route

The Liri's source is in the Monte Camiciola, elevation 1,701 metres (5,581 ft), in the Monti Simbruini of central Apennines (Abruzzo, comune of Cappadocia). It flows at first in a southeasterly direction through a long trough-like valley, parallel to the general direction of the Apennines, until it reaches the city of Sora.

In the upper part of Isola del Liri it receives the waters of Fibreno and then it divides into two branches which then rejoin, surrounding the lower part of the town (Isola del Liri stands for Liri Island). One branch makes a 28-metre (92 ft) high waterfall situated in the centre, a unique case in Europe.

A dam is built on the river after the conjunction with the Sacco River at Ceprano. The last important Liri's tributary is the Melfa, with which it joins near Aquino. After Cassino it receives the waters of the Gari, and afterwards it is known as Garigliano.

William Herschel Telescope

The William Herschel Telescope (WHT) is a 4.20-metre (165 in) optical/near-infrared reflecting telescope located at the Observatorio del Roque de los Muchachos on the island of La Palma in the Canary Islands, Spain. The telescope, which is named after William Herschel, is part of the Isaac Newton Group of Telescopes. It is funded by research councils from the United Kingdom, the Netherlands and Spain.

At the time of construction in 1987, the WHT was the third largest single optical telescope in the world. It is currently the second largest in Europe, and was the final telescope constructed by Grubb Parsons in their 150-year history.

The WHT is equipped with a wide range of instruments operating over the optical and near-infrared regimes. These are used by professional astronomers to conduct a wide range of astronomical research. Astronomers using the telescope discovered the first evidence for a supermassive black hole (Sgr A*) at the centre of the Milky Way, and made the first optical observation of a gamma-ray burst.