# geometry.txt, 12 Feb 12

!title geometry

!msgpostfix \n

23.44952444    | Obliquity of the ecliptic at J1900.0 (Newcomb)
23.44578787    | Obliquity of the ecliptic at B1950
23.43929111    | Obliquity of the ecliptic at J2000.0
0.39777715593  | sin(obliquity of the ecliptic) at J2000.0
0.917482062069 | cos(obliquity of the ecliptic) at J2000.0
84381.448      | Obliquity of the ecliptic at J2000.0 in seconds

0.2617993877991494365385536152732919070164 | Convert radians to hours
3.8197186342054880584532103209403446888274 | Convert hours to radians

# Meeus, Astr.Alg. eq 16.4
!msgpostfix Convert geometric altitude to apparent altitude (atmospheric refraction)\n

!need all
10.3
 5.11
 0.0019279

# Meeus, Astr.Alg. eq 16.3
!msgpostfix Convert apparent altitude (atmospheric refraction) to geometric altitude\n

!need all
7.31
4.4
0.001351521673756

