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1 14???? (2011) ( ) ( ) ( ; ) We examine the value of ΔT at around AD 247. We found that there is a comment in the Jinshu ( ) on the eclipse on March 24, 247 (Julian Calendar). The comment suggests that the eclipse was not total but deep. We obtain ΔT > 7750 in contrast to the result of Tanikawa et al.(2010) which stated the value close around ΔT = 8000 is too large and is improbable. The ΔT result says that the maginitude of the eclipse on March 24, 247 in Kyushu Island is not total but deep. In particular, islands is the north shore of the Kyushu may have experienced a total eclipse. We discuss some implications. 1 [1],.,.,,, ( ). ΔT. [1],, 7692 < ΔT <7933., ΔT = [1], 247 ΔT = 70,. [1] 2., ΔT,., [1]. 247 ( ). ΔT 4..., (, [8])., 150,., [1],.., 247 ΔT. 1

2 2 247 ΔT ( ).,., ΔT,.., : ( )... :,,.,.,, [ ],, [ ], [ ]. [ ], [ ],,..... ( 3 III,,, 1977,, p.74).,.,. ( ) :., ( ). ( ), ,,.,,, ΔT., ΔT >7750 ( 1 ). 0.99, 7750 < ΔT <8900 ( 2)., , ΔT 9700 ( 3). 2

3 Solar Eclipse Chengdu Jianye TT - UT = sec Corr. to tidal term 0.00 "/cy^2 1: , ΔT = 7750,. Solar Eclipse Chengdu Jianye TT - UT = sec Corr. to tidal term 0.00 "/cy^2 2: , ΔT = 8900,

4 Solar Eclipse Chengdu Jianye TT - UT = sec Corr. to tidal term 0.00 "/cy^2 3: , ΔT , 247 ΔT >7750. ΔT ( )., 247., 1.,., (, 280 ), (, ), (, )..,.,,.,,., ( 265 ),., 1, 2, 3 (Chengdu), (Jianye), , 0.95 ΔT > ΔT 4. ΔT 15000,.. ( ) 243,

5 ,. 243,.. ( ), 648, Solar Eclipse Chengdu Jianye TT - UT = sec Corr. to tidal term 0.00 "/cy^2 4: ΔT = ,, ,, ΔT. 2. ( ),,, ΔT., ΔT,.. 200, 212, 216, 221 ΔT ( 1,2) ,. ΔT < < ΔT ( 12 ). ΔT <7500, 8900 < ΔT., < ΔT, ΔT.,, ΔT. 4. 5

6 1: No (,, ) :? (,, ) ( ) (, ) ( ) (, ) ( ) ( ) ( ) (, ) (, ) (,, ) (, ) (, ) ( ) ( ) (, ) (, ) (, ) ( ) (, )... ( ) (, ) (, ) (, ) (,, ) (, ) (,, ) ( )? ( ) ( ) 6

7 2: ΔT OPP.# YMD Delta T Remarks ΔT <11110 ( ) ΔT < ΔT <121 ( ) ΔT < ΔT < < ΔT < ΔT < ΔT < ΔT <60 70 < ΔT ΔT < < ΔT <7850 ( ) ΔT < < ΔT ΔT < < ΔT < < ΔT < ΔT <110 ( ), ;. ( ) , 200 < ΔT, ΔT <10900 ( 11 ) ,., ΔT <60, 70 < ΔT ( 12 ) , 6500 < ΔT <7850., 6, 316, 341, Stephenson([2]). Fotheringham([13]), Stephenson , ΔT = 8100, ΔT = 80 ΔT = ΔT,.,, , 2,.., 2 50,, 2., Stephenson (1997) 360 ΔT 2 ΔT ΔT [1], ΔT 500,.,. Stephenson (1997) Fig 14.1, ΔT, 1 1 ( ). 1 7

8 ,,, 2, ΔT 2., ΔT 2,., 19 ΔT. ΔT TT UT ΔT =TT UT. TT Newcomb ET. Newcomb UT., ΔT,. 150 ΔT 66. LOD (Legth of Day), ms, 19 24, 1998, 2011 LOD ms., 150 LOD 3ms 1ms ( 5 UT1 UTC( ) UTC TAI( ), 6 LOD 24h, UT UT1, UTC, TAI, 19 UT1 UTC ΔT ) : UT1 TAI( ) UTC TAI( ) 200 ΔT. Stephenson (1997), ΔT 200 LOD ms. ΔT , LOD ms, ms., ω, ω ms/24 h =

9 ms : LOD 24h L = Iω, ω, I. I I =0.4MR 2 (M, R ), I =0.33MR 2 = kg m 2., M = kg, R = m.,,,. ΔI =(2/3)mR 2 (m ) ΔI =( ) ( )kgm 2 = kg m 2, R = m m = kg = g km 2 = cm 2, 1.0 g/cm 3 ( g/cm 3 ), h h =( g)/(1.0 g/cm 3 )/( cm 2 ) = 390 cm, 4m., km 2 = cm 2, 0.9 g/cm 3, D D =( g)/(0.9 g/cm 3 )/( cm 2 )=11, 000 cm = 110 m, 100 m. 100, LOD ms.,. 9

10 5 [1], 247 ΔT > ΔT = 8500, 8900, , ,,, ,.,, ([12]). 247,,,. [1], : 2010, 13, [2] Stephenson, F.R.: 1997, Historical Eclipses and Earth s Rotation, Cambridge University Press. [3] ( ): 1964,,. [4],,, ( ): 1994, ( ),, 4 1. [5], : 2009, :,,, [6], : 2008, [7] Sôma, M., Tanikawa, K. and Kawabata, K.-A.: 2003, Earth s rate of rotation between 700 BC and 1000 AD derived from ancient solar eclipses, Journées [8] : 1987,, ; ( ),, [9] :,. [10] :,. [11] :,. [12] : 2003,,. [13] Fotheringham, J.K.: 1920, MN 81,

11 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^ Magnitude Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^ Magnitude Solar Eclipse Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^ Magnitude : , ΔT = 7750,. 11

12 . 2 ΔT. 50 Solar Eclipse Jianye Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 8: ,

13 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 9: , 0.95 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 10:

14 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 11:

15 Solar Eclipse Chengdu Jianye Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Chengdu Jianye Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 12: ,

16 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 13: , ΔT = 10900, ΔT =

17 Solar Eclipse Kyoto Mizushima Asuka TT - UT = 70.0 sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Kyoto Mizushima Asuka TT - UT = 60.0 sec Corr. to tidal term 0.00 "/cy^2 14: ,

18 Solar Eclipse Chengdu Jianye Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Chengdu Jianye Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 15: ,

19 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 16: ,

20 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 17: ,

21 Solar Eclipse Kyoto Mizushima Asuka TT - UT = 80.0 sec Corr. to tidal term 0.00 "/cy^ Magnitude Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^ Magnitude :

22 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 Solar Eclipse Kyoto Mizushima Asuka TT - UT = sec Corr. to tidal term 0.00 "/cy^2 19: ,

23 Solar Eclipse TT - UT = sec Corr. to tidal term 0.00 "/cy^2 20: ,

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