Mathematical Sciences Classification System
85Axx - Astronomy and astrophysics 
{For celestial mechanics, see  70F15}
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                            85A04General
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                            85A05Galactic and stellar dynamics
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                            85A15Galactic and stellar structure
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                            85A20Planetary atmospheres
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                            85A25Radiative transfer
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                            85A30Hydrodynamic and hydromagnetic problems [See also 76Y05]
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                            85A35Statistical astronomy
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                            85A40Cosmology {For relativistic cosmology, see 83F05}
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                            85A99Miscellaneous topics