the library. In the upper storey were further observational spaces as well as scientific work areas. The long east wing housed the living quarters of the director on the ground floor and was adorned with a temple front, which as the main frontage showed the God of Light Apollo with a quadriga in relief on the gables. To the east of the building stood a small house with the living quarters of the castellan. The observatory got a meridian circle from Karl Pistor. On 24 April 1835 Encke could move into the new observatory, along with his newly appointed assistant Johann Gottfried Galle. On 19 May the first observations were carried out although the building was only fully finished at the end of 1835. Galle had applied to become assistant to Encke a considerable time before the building became ready for occupancy. From May to August 1835 the Königsberg astronomer Friedrich Wilhelm Bessel carried out pendulum observations in the ″little magnetic house″ („Magnetisches Häuschen") in the grounds of the observatory (see Freydanck's painting on this page) for the creation of a new Prussian measurement of length. In 1837 Encke discovered with the Fraunhofer refractor the gap in the rings of Saturn, later on named after him, with the Fraunhofer refractor, and in 1838 Galle discovered a further dark ring of Saturn – the C-Ring – as well as three new comets from 1839 to 1840. On 23 September 1846, Galle and astronomy student Heinrich Louis d’Arrest, since 1845 assistant at the observatory, discovered the planet Neptune, on the basis of positional calculations send by the Frenchman Urbain Le Verrier. After an initial lack of success they conferred the Le Verrier data with a newly published sheet of the „Berliner Akademische Sternkarte", edited by the Prussian Academy of Science. The letter from Le Verrier had coincidentally reached his close acquaintance Galle on the same day as Encke's 55th birthday, who gave his permission to search around the given celestial positions. At other observatories, the request of the French astronomer was viewed as not having sufficiently promising chances of success, of detecting another large planet on the basis of the deviations between theory and observations for the orbit of Uranus. This included Paris Observatory, whose director Le Verrier later became. By virtue of the discovery of Neptune, Berlin Observatory gained worldwide renown. Beyond that they did much work on the calculation of