BUREAU INTERNATIONAL DE l'HEURE ANNUAL REPORT FOR 1970 Bernard GUINOT, Martine FEISSEL and Michel GRANVEAUD II EXTRACT: PAGES 63 TO 89 II Published for the International Council of Scientific Unions with the financial assistance of the UNESCO Paris .1971 All eommuraieatio,., should be addreued 10 : M. ,. DiTedeur, Bureau Iratemario,"" tU rHeure, 61, overalle tU rOblenJMoire, Pon..14· 63 Table 10 - Offsets and step adjustments of UTC. Date (at 0 h UT) Offsets Steps 1961 Jan. -150 x 10- 10 Aug. +0~050 1962 Jan. -130 x 10- 10 1963 Nov. -0~100 10 1964 Jan. -150 x 10- April -0~100 Sept. -0~100 1965 Jan. 1 -0~100 March 1 -0~100 July -0~100 Sept. -0~100 1966 Jan. -300 x 10- 10 1968 Feb. +0~100 Table valid until 1971 July 1 Table 11 - Relationship between AT and UTC, since 1961 Limits of validity (at 0 hUT) AT-UTe (J.D. Julian Day Number) 1961 Jan. 1 - 1961 Aug. 1~422 818 0 + (JD-2437 300.5) x 0~001 296 Aug. 1962 Jan. 1~372 818 0 + 1962 Jan. 1 - 1963 Nov. 1~845 858 0 + (JD-2437665.5) x 0~001 123 2 1963 Nov. 1964 Jan. 1~945 858 0 + 1964 Jan. 1 - April 3~240 130 0 + (JD-2438 761. 5) x 0~001 296 April 1 Sept. 3~340 130 0 + Sept. 1965 Jan. 3~440 130 0 + 1965 Jan. March 3~540 130 0 + March July 3~640 130 0 + July 1 Sept. 3~740 130 0 + Sept. 1 1966 Jan. 3~840 130 0 t 1966 Jan. 1 - 1968 Feb. 4~313 170 o + (JD-2439 126.5) x 0~002 592 1968 Feb. 4~213 170 0 t Table valid until 1971 J.uly 1 Table 1 2 - Relationship bettV een AT and SAT Limits of validity (at 0 hUT) AT-SAT Limits of validit y (at 0 hUT) AT-SAT 1967 Jan. 1 - 1967 March +5~354 600 1969 July 1 - 1969 Sept. +7~554 600 March 1 - June 554 600 Sept. 1 - Nov. 754 600 June Sept. 754 600 Nov. 1 1970 Feb. 954 600 Sept. 1 - Dec. 954 600 1970 Feb. 1 - April 8.154 600 Dec. 1968 March 6.154600 April 1 - July 354 600 1968 March 1 - May 354 600 July 1 - Sept. 1 554 600 May 1 - Aug. 554 600 Sept. 1 Nov. 1 754 600 Aug. 1 - Nov. 754 600 Nov. 1 - 1971 Feb. 954 600 Nov. 1 - 1969 Feb. 954 600 1971 Feb. 1 - April 9.154 600 1969 Feb. 1 - April 7.154600 April 1 - July 354 600 APril 1 - July 354 600 Table valid until 1971 July 64 Table 13 . Time comparisons between laboratories by clock transportations in 1970. (for abbreviations. see p. 23) Date J.D. Time comparisons Authority 1970 2400 000.5+ (unit = 1 microsecond) Jan. 16 40602.3 UTC (USNO) - UTC (NBS) (1) 0.3~0.1 USNO. DPRV. 160 23 609.2 UTC (USNO) UTC (RRL) 1063.9 .± 0.2 23 609.2 UTC (USNO) UTC (TAO) 205,0 .±. 0,2 Feb, 16 633,4 UTC (USNO) UTC (OP) 129,9 .±. 0,5 161 17 634,3 UTC (USNO) UTC (RGO) + 46,5.±. 0,5 21 638,4 UTC (USNO) UTC (ON) 120,1 USNO (2) Mar, 31 676.9 UTC (USNO) UTC (APO) (3) + 29,5.±.. 0,5 USNO.DPRV. 170 Apr, 15 691.3 UTC (USNO) UTC (ROJ) 25.1.± 0.5 20 696,2 UTe (USNO) UTe (TAO) 19104 i 0,2 20 696.3 UTe (USNO) UTe (RRL) 1052,5.± 0,2 25 701. 1 UTe (USNO) UTe (TCL) (4) 5,7 .± 0,2 171 May 12 718.5 UTe (OP) UTe (ON) + 15.0 Ebauches S.A 12 718.6 UTe (USNO) UTA (NRe) + 156.0.±.. 0.2 USNO.DPRV. 176 27 733.5 UTe (OP) UTe (ON) + 13.5 Ebauches S.A Jun. 18 755.7 UTe (USNO) UTe (NBS) + 1. 3 .±. O. 1 USNO.DPRV. 178 22 759.3 UTe (USNO) UTe {OP) 137.0 .±. 0.5 22 759.6 UTe (USNO) UTe (RGO) + 45.1 i. 0.5 USNO (5) Jul. 22 789.3 UTC (USNO) UTC (TeL) (4) 7.7 i. 0.2 USNO.DPRV. 184 29 796.1 UTe (USNO) UTe (RRL) 1043.1 .±. 0.2 29 796.1 UTe (USNO) UTe (TAO) 179.1 i. 0.2 Aug. 15 813.3 UTe (USNO) UTC (OP) 139.4 .±. 0.2 U.S. Coast Guard Sept. 9 838.9 UTe (OP) UTe (RGO) + 177.1.±. 0.1 O.N.E.R.A (6) 10 839.5 UTe (OP) UTA (NRC) + 298.1 i. 0.1 10 839.7 UTe (USNO) UTe (OP) 136.2 i. 0.1 14 843.8 UTe (USNO) UTe (OP) 136.2 i. 0.1 15 844.5 UTe (OP) UTe (RGO) =+ 177.1.±.0.1 16 845.6 UTe (USNO) UTe (ROJ) 54.8 .±. 0.5 USNO.DPRV. 191 25 854.0 UTe (USNO) UTe (APO) (3) + 28.7 i. 0.5 192 28 857.2 UTe (USNO) UTe (MSO) + 17.4 i. 0.5 29 858.5 UTe (USNO) UTe (RGO) + 40.3 i. 0.5 USNO (5) Oct. 12 871.5 UTe (USNO) UTe (DHI) 135.2 .±. 0.5 USNO.DPRV. 196 13 872.4 UTe (USNO) UTA (PTB) 320.0 .±. 0.5 20 879.3 UTe (USNO) UTe (OP) 137.4.±.. 0.5 23 E82.0 UTe (RRL) - UTe (ILOM) • + 647.5 i. O. 1 RRL. ILOM Nov. 12 902.1 UTe (USNO) UTe (RRL) 1033.2 i. 0.2 199 12 902.1 UTe (USNO) UTe (TAO) 167.1 i. 0.2 15 905.2 UTe (USNO) UTe (TeL) (4) 7.3 .±. 0.2 Dec. 3 923.6 UTe (USNO) UTe (NBS) 0.8 i. 0.1 202 (1) . The measurement has been carried out with respect to the clock #t 8 of NBS. the suitable correction communicated by NBS has been app lied. (2) - Clock transportation carried out by USNO;the result has been reported by Neuchltel observatory. (3) - APO(previously called PMG) Australian Post Office. Research Lahoratories. Melbourne. Australia. (4) • TCL : Telecommunication Laboratories. Taiwan. Republic of China. (5) - Clock transportation carried out by USNO : the result has been reported by a letter of USNO. (6) • ONERA : Office National d'Etudes et Recherches Aerospatiales • France - Comparisons by airborne clock without;, landing. 65 Tab I e 14 • Campa r j sons with the BI H times by radioelectric methods Roman types: results obtained by LORAN-C, Italics : by vI! and other methods, Between parenthesis : without initial time comparison (arbitrary origin). Important. Consult notes, p. 70 and the explanations p. 23 - 27. Laboratory DHI DO F FOA lEN IGMA Time scales UTC UTC AT UTC UTe UTe Date(Oh UT) J.D. -UTC(DHI) -UTC(OO) -TA(F) -UTC(FOA) - JTC(IEN) -UTC(IGMA) 1970 2400000.5 IlS IlS IlS Il s Ils IlS + Jan. 3 40589 + 3.5 +276.4- -37.2 +194.5 ( 0) 13 599 3.6 276.7 37.4 196.0 (- 1) 23 609 2.9 277.2 38.0 196.4 (- LJ) Feb. 2 619 2.1 278.6 38.0 192.7 (- 5) 12 629 + 1. 1 279.3 38.2 185.0 (- LJ) 22 639 - 0.3 +280.6 -38.7 +177.7 (- 3) March 4 649 1.4 280.9 38.8 171.6 (- 1) 14 659 1.9 283.0 39.0 164.9 (- 5) 24 669 3.2 284.2 39.5 158.3 (- 2) April 3 679 4.0 285.0 39.9 152.9 (- 2) 13 689 - 4.9 +286.2 -40.4 +152. 1 ( +10) ( 0) 23 699 5.7 40.5 151. 2 (+ 12) (- 3) May 3 709 6.7 40.7 150.0 (+12) (- 6) 13 719 7.7 41.3 149.3 (+11) (- 9) 23 729 8.6 41.8 149.1 (+11) (- 8) June 2 739 - 9.3 -42.1 +148.7 (+ 10) (-11) 12 749 10.7 42.5 148.1 (+ 8) (-lLJ) 22 759 11.9 42.7 148.4 (+10) (-16) July 2 769 12.5 42.6 149.9 (+ 12) (-19) 12 779 13.1 42.7 149.7 ( +13) (-23) 22 789 -11.7 -42.9 +147.6 ( +21) (-26) Aug. 1 799 -12 43.0 146.2 (+26) (-31) 11 809 7 43.5 145.4 ( +27) (-33) 21 819 8 43.4 144.6 ( +35) (-35) 31 829 5 43.7 144.2 (+36) ( -35) Sept. 10 839 - 5 -44.0 +143.3 (+37) (-3LJ) 20 849 44.3 142.4 (+LJ3) (-37) 30 859 44.9 141.2 (+LJ2) (-36) Oct. 10 869 - 0.6 45.4 140.0 (+LJ1) (-39) 20 879 1.1 45.7 139.1 (+LJ2) (-39) 30 889 - 1.4 -45.9 +138.2 (+LJ5) (-LJO) Nov. 9 899 1.7 46.3 137.5 (+LJ5) (-LJO) 19 909 2.3 46.9 137.0 (+LJ8) (-38) 29 919 2.9 47.2 136.9 (+LJ8) (-LJ3) Dec. 9 929 3.5 47.4 137.1 (+LJ6) (-LJLJ) 19 939 - 4.1 -47.8 +135.9 (+LJ5) (-LJ5) 29 949 4.4 47.9 135.0 ( +LJ9) (-LJ6) - See Corrigendum for 1969, P. 70 . 66 Tabl8 14 (cant.) Laboratory ILOM MSO NBS NIS NPL ~ Time scales UTC UTC AT UTC UTC UTe Date(Oh UT) J.D. -UTe(ILOM) -UTC(MSO) -AT (NBS) -UTC(NBS) -UTC(NIS) -UTC(NPL) 1970 2400000.5 I1s I1s I1 S + Jan. 3 40589 -283.9 -159 -45263.4 +124.8 ( + 1) ( -73) 13 599 284.1 159 263.0 124.8 (+ 1) (-73) 23 609 283.8 lL17 262.4 125.0 (- 1) ( -69) Feb.