There is a relationship between time and technology which has been obvious since the classical philosophies of time. Even telling the time necessitates technologies relating to measuring and counting. Technological developments have changed the temporal state of our reality. Key terms such as deceleration, synchronisation, prevention and de-temporalisation point to relevant problem areas in this respect. This yearbook, whose thematic focus is 2021, endeavours to reveal new technological and philosophical perspectives on the temporal conditions in which we think, communicate, work and live. With contributions by Cornelius Borck, Stefan Böschen, Christopher Coenen, Olivier Del Fabbro, Andreas Folkers, Yvonne Förster, Alexander Friedrich, Steve Fuller, Gabriele Gramelsberger, Thilo Hagendorff, Thomas Hilgers, Dirk Hommrich, Erich Hörl, Sebastian Lederle, Janne Mende, Jürgen Meutgens, Carl Mitcham, Oliver Müller, Alfred Nordmann, Tom Poljanšek, Maurice Merleau-Ponty, Ludger Schwarte, Astrid Schwarz, René von Schomberg, René Umlauf, Sarine Waltenspül, Bastian Weiß, Langdon Winner and Yongmou Liu.