85-XX Astronomy and astrophysics {For celestial mechanics, see <a href="#code:70F15">70F15</a>}

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 also be assigned at least one classification number from Section 01)

85-04 Explicit machine computation and programs (not the theory of computation or programming)

85-06 Proceedings, conferences, collections, etc.

85Axx Astronomy and astrophysics {For celestial mechanics, see <a href="#code:70F15">70F15</a>}

85A30 Hydrodynamic and hydromagnetic problems [See also <a href="#code:76Y05">76Y05</a>]

85A40 Cosmology {For relativistic cosmology, see <a href="#code:83F05">83F05</a>}

86-XX Geophysics [See also <a href="#code:76U05">76U05</a>, <a href="#code:76V05">76V05</a>]

86-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

86-01 Instructional exposition (textbooks, tutorial papers, etc.)

86-02 Research exposition (monographs, survey articles)

86-03 Historical (must also be assigned at least one classification number from Section 01)

86-04 Explicit machine computation and programs (not the theory of computation or programming)

86-06 Proceedings, conferences, collections, etc.

86Axx Geophysics [See also <a href="#code:76U05">76U05</a>, <a href="#code:76V05">76V05</a>]

86A05 Hydrology, hydrography, oceanography [See also <a href="#code:76Bxx">76Bxx</a>, <a href="#code:76E20">76E20</a>, <a href="#code:76Q05">76Q05</a>, <a href="#code:76Rxx">76Rxx</a>, <a href="#code:76U05">76U05</a>]

86A10 Meteorology and atmospheric physics [See also <a href="#code:76Bxx">76Bxx</a>, <a href="#code:76E20">76E20</a>, <a href="#code:76N15">76N15</a>, <a href="#code:76Q05">76Q05</a>, <a href="#code:76Rxx">76Rxx</a>, <a href="#code:76U05">76U05</a>]

86A17 Global dynamics, earthquake problems

86A22 Inverse problems [See also <a href="#code:35R30">35R30</a>]

86A25 Geo-electricity and geomagnetism [See also <a href="#code:76W05">76W05</a>, <a href="#code:78A25">78A25</a>]