===========================                         ============================
                              BUREAU DES LONGITUDES

                           LUNAR SOLUTION ELP2000-82B

                                 1996, February
===========================                         ============================

These files and programs are associated to :

ELP 2000-85: a semi-analytical lunar ephemeris adequate for historical times
     Chapront-Touze M., Chapront J.
    <Astron. Astrophys. 190, 342 (1988)>

The Lunar Ephemeris ELP 2000
     Chapront-Touze M., Chapront J.
    <Astron. Astrophys. 124,  50 (1983)>

CDS anonymous ftp : pub/cats/VI/79

================================================================================

Description:

    The theory of the lunar motion consists of the series of the
    semi-analytical solution ELP2000-82. The constants of the subsequent
    lunar ephemeris are fitted to the numerical integration DE200/LE200 of
    the Jet Propulsion Laboratory and the arguments come from the
    semi-analytical theory ELP 2000-85.

Authors' Address:

    M. Chapront-Touze, J. Chapront
    Bureau des Longitudes, CNRS URA 707
    77, Avenue Denfert-Rochereau
    75014, Paris, France
    Tel : (33) 1 40 51 22 66  (33) 1 40 51 22 71
    Fax : (33) 1 46 33 28 34
    E-mail : jchapron@bdl.fr

Contents:

    The semi-analytical lunar theory ELP 2000-82 contains purely
    trigonometric series and Poisson series proportional to the time (t)
    or the square of the time (t2).

    36 data files include the series related to various components of the
    theory for the 3 spherical coordinates: longitude, latitude and
    distance. Units are arcsecond for longitude and latitude, kilometer
    for distance.

    Arguments, constants and coordinate systems are described in the notice
    "Lunar solution ELP 2000-82B" (elp82b.ps).

    Fortran subroutines are provided for the computation of ephemerides :
    - elp82b_1 is used with small computer memory.
    - elp82b_2 is used with computer memory larger than 1.3 Mo.
    The computation is faster with the subroutine elp82b_2.

    Two executable programs are also provided to simply check up the
    computation of ephemerides (UNIX and DOS operating system) :
    - test1.x   : test program with subroutine elp82b_1 (UNIX).
    - test2.x   : test program with subroutine elp82b_2 (UNIX).
    - test1.exe : test program with subroutine elp82b_1 (DOS).
    - test2.exe : test program with subroutine elp82b_2 (DOS).


File Summary:

--------------------------------------------------------------------------------
FileName      Lrecl    Records   Explanations
--------------------------------------------------------------------------------

README          80          .    This file
elp82b.ps      512       2413    Postscript Notice "Lunar solution ELP 2000-82B"

elp82b_1        80        346    Fortran77 Subroutine (small computer memory)
elp82b_2        80        437    Fortran77 Subroutine (computer memory > 1.3 Mo)

test1.x        size :   58 Ko    Executable Program Test1 (Unix).
test2.x        size :   58 Mo    Executable Program Test2 (Unix).

test1.exe      size :   52 Ko    Executable Program Test1 (Dos).
test2.exe      size :  1.3 Mo    Executable Program Test2 (Dos).

ELP1            99       1024    Main problem. Longitude periodic terms (sine)
ELP2            99        919    Main problem. Latitude (sine)
ELP3            99        705    Main problem. Distance (cosine)

ELP4            45        348    Earth figure perturbations. Longitude
ELP5            45        317    Earth figure perturbations. Latitude
ELP6            45        238    Earth figure perturbations. Distance

ELP7            45         15    Earth figure perturbations. Longitude/t
ELP8            45         12    Earth figure perturbations. Latitude/t
ELP9            45          9    Earth figure perturbations. Distance/t

ELP10           63      14329    Planetary perturbations. Table 1 Longitude
ELP11           63       5234    Planetary perturbations. Table 1 Latitude
ELP12           63       6632    Planetary perturbations. Table 1 Distance

ELP13           63       4385    Planetary perturbations. Table 1 Longitude/t
ELP14           63        834    Planetary perturbations. Table 1 Latitude/t
ELP15           63       1716    Planetary perturbations. Table 1 Distance/t

ELP16           63        171    Planetary perturbations. Table 2 Longitude
ELP17           63        151    Planetary perturbations. Table 2 Latitude
ELP18           63        115    Planetary perturbations. Table 2 Distance

ELP19           63        227    Planetary perturbations. Table 2 Longitude/t
ELP20           63        189    Planetary perturbations. Table 2 Latitude/t
ELP21           63        170    Planetary perturbations. Table 2 Distance/t

ELP22           45          4    Tidal effects. Longitude
ELP23           45          3    Tidal effects. Latitude
ELP24           45          3    Tidal effects. Distance

ELP25           45          7    Tidal effects. Longitude/t
ELP26           45          5    Tidal effects. Latitude/t
ELP27           45          6    Tidal effects. Distance/t

ELP28           45         21    Moon figure perturbations. Longitude
ELP29           45         13    Moon figure perturbations. Latitude
ELP30           45         15    Moon figure perturbations. Distance

ELP31           45         12    Relativistic perturbations. Longitude
ELP32           45          5    Relativistic perturbations. Latitude
ELP33           45         11    Relativistic perturbations. Distance

ELP34           53         29    Planetary perturbations - solar eccentricity.
                                    Longitude/t2
ELP35           52         14    Planetary perturbations - solar eccentricity.
                                    Latitude/t2
ELP36           52         20    Planetary perturbations - solar eccentricity.
                                    Distance/t2

--------------------------------------------------------------------------------

Remark:

    The document elp82b.ps ("LUNAR SOLUTION ELP 2000-82B") can be
    requested directly to the authors. The sources which consist in
    36 files (the semi-analytical series) and the programs of use are
    also available on diskettes (DOS system).

================================================================================

(End of document)                   G. Francou (BDL)                    Feb 1996

================================================================================
User feed-back is encouraged. Unless otherwise specified, send comments and bug
reports to:                    E-mail     : comments@bdl.fr
                               Fax        : (33) 1 46 33 28 34
                               Postal mail: Bureau des longitudes
                                            77 avenue Denfert Rochereau
                                            F-75014 PARIS
================================================================================
