Jacques Colin has obtained his PhD from the Franche Comté University in France. He first began his research career at the Besancon observatory on the subject of the measurement of time and during his PhD thesis worked on the dynamical evolution of galaxies. He spent two years as a postdoctoral fellow at the European Southern Observatory (ESO) in Chile. He was then elected the director of the Bordeaux Observatory for 13 years, followed by 10 years as the director of the Cote d'Azur and Nice Observatory. He spent a year at the Niels Bohr Institute in Copenhagen as a visiting professor and is presently emeritus astronomer at the Sorbonne University and continues his research at the Institut d'Astrophysique de Paris (IAP). His main research concerns cosmology and more precisely the accelerated expansion of the Universe and analysis of the cosmological dipole. He is presently finishing an essay on the nature of the “present instant” , which is less understood than the “time” itself.