Table 2. Shadow Contacts and Circumstances,
Total Solar Eclipse of 1999 August 11

T = 64.6 s = 000°16´09.6"E

                             Dynamical               Ephemeris      True
                               Time      Latitude    Longitude(*) Longitude(**)
                             h  m  s
Contacts of Penumbra:  P1   08:27:18.9   30°20.1´N   044°45.6´W   044°29.4´W
                       P4   13:41:10.2   06°38.3´N   067°50.0´E   068°06.2´E
  South Limits
of Penumbral Path:     S1   09:09:07.2   10°07.7´N   048°46.6´W   048°30.4´W
                       S2   12:59:11.4   13°43.1´S   072°40.6´E   072°56.8´E

 Contacts of Umbra:    U1   09:30:56.5   40°54.7´N   065°10.7´W   064°54.5´W
                       U2   09:31:54.3   41°09.4´N   065°32.4´W   065°16.2´W
                       U3   12:36:35.4   17°40.4´N   087°09.6´E   087°25.8´E
                       U4   12:37:27.8   17°26.7´N   086°52.4´E   087°08.6´E
North/South Limits
  of Umbral Path:      N1   09:31:42.6   41°16.4´N   065°33.0´W   065°16.8´W
                       S1   09:31:08.3   40°47.7´N   065°10.2´W   064°54.0´W
                       N2   12:36:46.0   17°46.9´N   087°09.0´E   087°25.2´E
                       S2   12:37:17.0   17°20.1´N   086°53.1´E   087°09.3´E

 Extreme Limits
 of Center Line:       C1   09:31:25.4   41°02.0´N   065°21.5´W   065°05.4´W
                       C2   12:37:01.6   17°33.5´N   087°01.0´E   087°17.2´E

   Instant of 
Greatest Eclipse:      G0   11:04:09.0   45°04.5´N   024°01.8´E   024°18.0´E

Circumstances at
Greatest Eclipse:   Sun's Altitude =  59.3°         Path Width = 112.3 km
                     Sun's Azimuth = 196.7°   Central Duration =  02m22.9s

* Ephemeris Longitude is the terrestrial dynamical longitude assuming a uniformly rotating Earth. ** True Longitude is calculated by correcting the Ephemeris Longitude for the non-uniform rotation of Earth. (T.L. = E.L. - 1.002738*T/240, where T(in seconds) = TDT - UT)
Note: Longitude is measured positive to the East.

Since T is not known in advance, the value used in the predictions is an extrapolation based on pre-1997 measurements. Nevertheless, the actual value is expected to fall within 0.3 seconds of the estimated T used here.

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