! A1.0 Fundamental constants
      REAL :: RPI,RCLUM,RHPLA,RKBOL,RNAVO
! A1.1 Astronomical constants
      REAL :: RDAY,REA,REPSM,RSIYEA,RSIDAY,ROMEGA
! A1.1.bis Constantes concernant l'orbite de la Terre:
      REAL :: R_ecc, R_peri, R_incl
! A1.2 Geoide
      REAL :: RA,RG,R1SA
! A1.3 Radiation
      REAL :: RSIGMA,RI0
! A1.4 Thermodynamic gas phase
      REAL :: R,RMD,RMV,RD,RV,RCPD,RCPV,RCVD,RCVV
      REAL :: RKAPPA,RETV
! A1.5,6 Thermodynamic liquid,solid phases
      REAL :: RCW,RCS
! A1.7 Thermodynamic transition of phase
      REAL :: RLVTT,RLSTT,RLMLT,RTT,RATM
! A1.8 Curve of saturation
      REAL :: RESTT,RALPW,RBETW,RGAMW,RALPS,RBETS,RGAMS
      REAL :: RALPD,RBETD,RGAMD
!
      COMMON/YOMCST/RPI   ,RCLUM ,RHPLA ,RKBOL ,RNAVO &
     &      ,RDAY  ,REA   ,REPSM ,RSIYEA,RSIDAY,ROMEGA &
     &      ,R_ecc, R_peri, R_incl &
     &      ,RA    ,RG    ,R1SA &
     &      ,RSIGMA,RI0 &
     &      ,R     ,RMD   ,RMV   ,RD    ,RV    ,RCPD &
     &      ,RCPV  ,RCVD  ,RCVV  ,RKAPPA,RETV &
     &      ,RCW   ,RCS &
     &      ,RLVTT ,RLSTT ,RLMLT ,RTT   ,RATM &
     &      ,RESTT ,RALPW ,RBETW ,RGAMW ,RALPS ,RBETS ,RGAMS &
     &      ,RALPD ,RBETD ,RGAMD