Table 1. Elements of the Total Solar Eclipse of 1999 August 11


Geocentric Conjunction      10:52:16.66 TDT     J.D. = 2451401.952971
 of Sun & Moon in R.A.:   (=10:51:12.06 UT)

      Instant of            11:04:09.01 TDT     J.D. = 2451401.961215
   Greatest Eclipse:      (=11:03:04.41 UT)


Geocentric Coordinates of Sun & Moon at Greatest Eclipse (DE200/LE200):

Sun:       R.A. = 09h23m08.297s       Moon:      R.A. = 09h23m34.531s
           Dec. =+15°19´39.72"                   Dec. =+15°48´38.51"
  Semi-Diameter =    15´46.77"          Semi-Diameter =    16´00.34"
    Eq.Hor.Par. =        8.68"            Eq.Hor.Par. =  0°58´44.24"
          R.A. =        9.467s/h              R.A. =      142.037s/h
          Dec. =      -44.35"/h               Dec. =     -462.21"/h


Lunar Radius   k1 = 0.2725076 (Penumbra)        Shift in      b =  0.00"
 Constants:    k2 = 0.2722810 (Umbra)       Lunar Position:   l =  0.00"

Geocentric Libration:   l =   4.8°       Brown Lun. No. = 1232
(Optical + Physical)    b =  -0.8°         Saros Series =  145 (21/77)
                        c =  19.7°            Ephemeris = (DE200/LE200)

Eclipse Magnitude = 1.02859        Gamma = 0.50623        T =    64.6 s



Polynomial Besselian Elements for: 1999 Aug 11 11:00:00.0 TDT (=t0)

  n        x          y         d          l1         l2          

  0   0.0700559  0.5028388 15.3273401  0.5424893 -0.0036496 343.690308
  1   0.5443045 -0.1184931 -0.0120348  0.0001168  0.0001163  15.002983
  2  -0.0000406 -0.0001158 -0.0000033 -0.0000117 -0.0000116   0.000002
  3  -0.0000081  0.0000017  0.0000000  0.0000000  0.0000000   0.000000

tan f1 = 0.0046129

tan f2 = 0.0045900

At time t1 (decimal hours), each Besselian element is evaluated by:

where: a = x, y, d, l1, l2, or ; t = t1 - t0 (decimal hours), and t0 = 11.000 TDT.

The Besselian elements were derived from a least-squares fit to elements calculated at five separate times over a six hour period centered at t1. Thus the Besselian elements are valid over the period 8.00 < t0 < 14.00 TDT.


Saros Series 145: Member 21 of 77 eclipses in series.
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