85-XX Astronomy and astrophysics,

• 85-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
• 85-01 Instructional exposition (textbooks, tutorial papers, etc.)
• 85-02 Research exposition (monographs, survey articles)
• 85-03 Historical (must be assigned at least one classification number from 01-XX)
• 85-04 Explicit machine computation and programs (not the theory of computation or programming)
• 85-05 Experimental papers
• 85-06 Proceedings, conferences, collections, etc.
• 85-08 Computational methods
• 85A04 General
• 85A05 Galactic and stellar dynamics
• 85A15 Galactic and stellar structure
• 85A20 Stellar atmospheres
• 85A25 Radiative transfer
• 85A30 Hydrodynamic and hydromagnetic problems, See also {76Y05}
• 85A35 Statistical astronomy
• 85A40 Cosmology, {For relativistic cosmology, See 83F05}
• 85A45 Radio astronomy
• 85A99 Miscellaneous topics