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24h in winter 30 June adopted Al-type second pulsesd astronomical atomic clock atomic standards BIH announced BIH Annual Report BIH Circular Bureau of Standards CCIR code is given coordinated universal crystal clocks cycles D3—Foreign radio station DUT1 code information dUTl emphasized seconds markers Frequency kHz given by lengthening given in Appendix improved UTC system Interim Meeting International de l'Heure International Telecommunication Union January minute marker minute pulses minutes 15 modulation Morse code N.long National Bureau negative leap second Observatoire de Paris Physikalisch-Technische Bundesanstalt positive leap second preceding the indicated pulses are prolonged pulsesd are emitted Radio Consultative Committee Recommendation 460 Republic of Germany rotation Second pulses occur seconds markers Service Announcements standard-frequency and time-signal step step-time adjustments Study Group Table D3—Foreign radio Telecommunication time-signal emissions timekeeping U.S. Naval Observatory users USNO value of DUT1 worldwide primary VLF WWVB WWVH