/[lmdze]/trunk/phylmd/orbite.f
ViewVC logotype

Contents of /trunk/phylmd/orbite.f

Parent Directory Parent Directory | Revision Log Revision Log


Revision 317 - (show annotations)
Tue Dec 11 14:12:45 2018 UTC (5 years, 4 months ago) by guez
File size: 1504 byte(s)
Polish.
1 MODULE orbite_m
2
3 IMPLICIT NONE
4
5 CONTAINS
6
7 pure SUBROUTINE orbite(xjour, longi, dist)
8
9 ! From phylmd/orbite.F, version 1.1.1.1, 2004/05/19 12:53:08
10
11 ! Author: Z. X. Li (LMD/CNRS)
12 ! Date: 1993/08/18
13
14 ! Pour un jour donn\'e, calcule la longitude vraie de la Terre et
15 ! la distance Terre-Soleil.
16
17 use nr_util, only: deg_to_rad
18 USE yomcst, ONLY: r_ecc, r_peri
19
20 REAL, INTENT (IN):: xjour ! jour de l'ann\'ee \`a compter du premier janvier
21
22 REAL, INTENT (OUT):: longi
23 ! longitude vraie de la Terre dans son orbite solaire, par rapport
24 ! au point vernal (21 mars), en degr\'es
25
26 REAL, INTENT (OUT), OPTIONAL:: dist
27 ! distance terre-soleil (par rapport \`a la moyenne)
28
29 ! Local:
30 REAL xl, xllp, xee, xse, ranm
31
32 !----------------------------------------------------------------------
33
34 xl = r_peri + 180.
35 xllp = xl * deg_to_rad
36 xee = r_ecc**2
37 xse = sqrt(1. - xee)
38 ranm = 2. * ((r_ecc / 2 + r_ecc * xee / 8.) * (1. + xse) * sin(xllp) &
39 - xee / 4. * (0.5 + xse) * sin(2.*xllp) + r_ecc * xee / 8. &
40 * (1. / 3. + xse) * sin(3. * xllp)) + (xjour - 81.) * deg_to_rad - xllp
41 xee = xee * r_ecc
42 longi = (ranm + (2. * r_ecc - xee / 4.) * sin(ranm) + 5. / 4. * r_ecc**2 &
43 * sin(2 * ranm) + 13. / 12. * xee * sin(3. * ranm)) / deg_to_rad + xl
44
45 IF (present(dist)) dist = (1 - r_ecc**2) &
46 / (1 + r_ecc * cos(deg_to_rad * (longi - (r_peri + 180.))))
47
48 END SUBROUTINE orbite
49
50 END MODULE orbite_m

  ViewVC Help
Powered by ViewVC 1.1.21