Elisa Felicitas Arias

Elisa Felicitas Arias (born 1952) is an Argentine astronomer. She worked as Head of Time, Frequency and Gravimetry at the International Bureau of Weights and Measures (BIPM) between 1999 and 2017, and is recognised for her contributions to the definition and implementation of the International Celestial Reference System.

Early life and education Arias was born in 1952 in La Plata, Argentina. She was the only child of a pharmacist and a police commissioner. She also taught at that University. In a press release, she stated that the drift of about one minute every 60–90 years could be compared to the 16-minute annual variation between true solar time and mean solar time, the one hour offset by use of daylight time, and the several-hours offset in certain geographically extra-large time zones.

She wrote the prologue to the book Astronomy in Lilliput: Introductory Workshops on Space Sciences and collaborated with other professionals from the University of La Plata in preparing topics for the book Objective Universe.

Personal life Arias married in 1995 and had her only daughter two years later. Arias, F. One more second. Nature Phys 12, 1178 (2016). Arias, Elisa Felicitas, et al., editors. The Science of Time 2016 : Time in Astronomy & Society, Past, Present and Future. Springer eBooks, Springer International Publishing : Imprint : Springer, (2017) Arias, Felicitas. Atomic Time Scales and Their Applications in Astronomy. The Science of Time 2016, (2017), pp. 103–4 Arias, Elisa Felicitas. New Technologies and the Future of Timekeeping. The Science of Time 2016, (2017), pp. 379–89. Arias, Elisa Felicitas, and Gérard Petit. The Hyperfine Transition for the Definition of the Second. Annalen Der Physik, vol. 531, no. 5, (2019) Arias, Elisa Felicitas. PREFACE: Global Navigation Satellite Systems: Recent Scientific Advances. Advances in Space Research, vol. 74, no. 6, (2024), p. 2531