

















                                 T H E


              SSSSS           OOOOOO       FFFFFFFFFFFFF      AAAAAAA
           SSSSSSSSSS     OOOOOOOOOOOO     FFFFFFFFFFFF      AAAAAAAA
          SSSSSSSSSSS   OOOOOOOOOOOOOO    FFFFFFFFFFFF      AAAA AAAA
         SSSS      S   OOOOOO    OOOOO    FFFF             AAAA  AAAA
        SSSSS         OOOOO       OOOO   FFFFF            AAAA   AAAA
        SSSSSSSSSS    OOOO       OOOOO   FFFFFFFFFFFF    AAAA    AAAA
          SSSSSSSSS  OOOOO       OOOO   FFFFFFFFFFFF    AAAAAAAAAAAAA
              SSSSS  OOOO       OOOO    FFFF           AAAAAAAAAAAAAA
       S      SSSS   OOOOO    OOOOO    FFFF           AAAAAAAAAAAAAAA
      SSSSSSSSSSS    OOOOOOOOOOOOO     FFFF          AAAA       AAAAA
      SSSSSSSSS       OOOOOOOOOO      FFFF          AAAA        AAAAA
        SSSS            OOOOO         FFFF         AAAA         AAAAA


                            S O F T W A R E

                           L I B R A R I E S






                   International Astronomical Union

                   Division A: Fundamental Astronomy


                Standards of Fundamental Astronomy Board





                               Release 19

                            2023 October 11
