Abstract
Long-term studies of pulse arrival times for the pulsar PSR1937 + 21 yield estimates of the pulsar's period, spin-down rate and celestial coordinates with unprecedented accuracies. Over periods exceeding six months, this pulsar is at least comparable in stability to the best man-made atomic clocks. Our results place a limit on the energy density of low-frequency gravitational waves in the Universe.
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Davis, M., Taylor, J., Weisberg, J. et al. High-precision timing observations of the millisecond pulsar PSR1937 + 21. Nature 315, 547–550 (1985). https://doi.org/10.1038/315547a0
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DOI: https://doi.org/10.1038/315547a0
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