A delay in photoemission from atoms has been observed, revealing a 21 ± 5 attosecond delay between the emission of electrons from the 2p and 2s orbitals of neon atoms. This delay, detected using attosecond metrology, challenges the assumption that photoemission occurs instantaneously and provides a new basis for defining "time-zero" in atomic-scale chronoscopy. The results have implications for modeling electron dynamics and improving the precision of timing in ultrafast processes. The delay is attributed to the correlated motion of electrons and is not due to transport effects or external factors like the Stark effect. The study also highlights the importance of accurate timing in understanding electron correlations and the response of materials to external stimuli. The findings demonstrate the potential of attosecond streaking to measure ultrafast processes with high precision, enabling new insights into atomic-scale dynamics. The results are supported by both experimental data and theoretical simulations, showing that the delay is consistent with quantum mechanical predictions. The study underscores the need for precise timing in atomic-scale measurements and the role of attosecond technology in advancing our understanding of ultrafast electron dynamics.A delay in photoemission from atoms has been observed, revealing a 21 ± 5 attosecond delay between the emission of electrons from the 2p and 2s orbitals of neon atoms. This delay, detected using attosecond metrology, challenges the assumption that photoemission occurs instantaneously and provides a new basis for defining "time-zero" in atomic-scale chronoscopy. The results have implications for modeling electron dynamics and improving the precision of timing in ultrafast processes. The delay is attributed to the correlated motion of electrons and is not due to transport effects or external factors like the Stark effect. The study also highlights the importance of accurate timing in understanding electron correlations and the response of materials to external stimuli. The findings demonstrate the potential of attosecond streaking to measure ultrafast processes with high precision, enabling new insights into atomic-scale dynamics. The results are supported by both experimental data and theoretical simulations, showing that the delay is consistent with quantum mechanical predictions. The study underscores the need for precise timing in atomic-scale measurements and the role of attosecond technology in advancing our understanding of ultrafast electron dynamics.