Besselian Elements for Annular Solar Eclipse of 1922 Mar 28 (original) (raw)

Fred Espenak

The following table contains the Besselian elements for the Annular Solar Eclipse of 1922 Mar 28 .

The geographic coordinates of the eclipse path are in the Path Table . The global visibility of the eclipse is shown on an Orthographic Map . The features of this map are described in the Key to Solar Eclipse Path Tables. The path of the eclipse is displayed in greater detail on a Google Map .

Besselian Elements for the Annular Solar Eclipse of 1922 Mar 28

        Equatorial Conjunction:     13:11:48.1 TDT     J.D. = 2423142.049862
          (Sun & Moon in R.A.)    (=13:11:25.4 UT)

         Ecliptic Conjunction:      13:03:23.5 TDT     J.D. = 2423142.044021
         (Sun & Moon in Ec. Lo.)  (=13:03:00.7 UT)

              Instant of            13:05:25.9 TDT     J.D. = 2423142.045438
           Greatest Eclipse:      (=13:05:03.2 UT)


        --------------------------------------------------------------------------- 
                    Gamma =  0.1711            Ephemerides = VSOP87/ELP2000-82
        Eclipse Magnitude =  0.9381           Lunation No. =    -962
                       ΔT =    22.7 s         Saros Series =  128 (53/73)

        Lunar Radius   k1 = 0.272488 (Penumbra)        Shift in      Δb =  0.00"
         Constants:    k2 = 0.272281 (Umbra)       Lunar Position:   Δl =  0.00"

        --------------------------------------------------------------------------- 
        Geocentric Coordinates of Sun & Moon at Greatest Eclipse (VSOP87/ELP2000-82):

        Sun:       R.A. = 00h25m58.2s         Moon:      R.A. = 00h25m47.1s
                   Dec. =+02°48'27.5"                    Dec. =+02°57'17.8"
          Semi-Diameter =    16'01.1"           Semi-Diameter =    14'48.3"
            Eq.Hor.Par. =       08.8"             Eq.Hor.Par. =  0°54'19.9"

        --------------------------------------------------------------------------- 
        Polynomial Besselian Elements for:   1922 Mar 28   13:00:00.0 TDT  (=t0)

          n        x          y         d          l1         l2          μ

          0  -0.095378   0.149277    2.80580   0.568872   0.022621   13.67102
          1   0.4848910  0.1530355   0.015915 -0.0000579 -0.0000576  15.004360
          2   0.0000165 -0.0000178  -0.000001 -0.0000099 -0.0000099
          3  -0.0000055 -0.0000017

                         Tan ƒ1 = 0.0046839    Tan ƒ2 = 0.0046606

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

           a = a0 + a1*t + a2*t^2 + a3*t^3    (or a = Σ [an*t^n]; n = 0 to 3)

              where:    a = x, y, d, l1, l2, or μ
                        t = t1 - t0  (decimal hours) and t0 = 13.000 TDT


        The Besselian elements were derived from a least-squares fit to elements
        calculated at five uniformly spaced times over a six hour period centered at t0.
        The Besselian elements are valid over the period 10.00 ≤ t0 ≤ 16.00 TDT.

        Note that all times are expressed in Terrestrial Dynamical Time (TDT).

               Saros Series 128:  Member 53 of 73 eclipses in series.

Annular Solar Eclipse of 1922 Mar 28

Acknowledgments

Predictions for the Annular Solar Eclipse of 1922 Mar 28 were generated using the VSOP87/ELP2000-82 solar and lunar ephemerides and a value of ΔT = 22.7 seconds. The accuracy of the northern and southern edges of the eclipse path are limited to approximately 1-2 kilometers due to the lunar limb profile.

All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Permission is freely granted to reproduce this data when accompanied by an acknowledgment:

"Eclipse Predictions by Fred Espenak, NASA's GSFC"

For more information, see: NASA Copyright Information