The Deep-Sky Corner was created between 1996 and 2001 as a leisure project by a group of amateur astronomers. Virtual time travel: 1999, 2001, 2002. After that, the Deep-Sky Corner stayed asleep on astro!nfo until September 2020, when that website was discontinued. Now it has risen again on its own domain and is continuously updated.
Added «Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» on constellation pages
Historical constellation maps from Johann Bayer's «Uranometria» (1603) and Johannes Hevelius «Prodromus Astronomiae» (1690)