en
520 Astronomy
521 Celestial mechanics
fr
520 Astronomie
521 Mécanique céleste
es
520 Astronomía
521 Mecánica celeste
sv
520 Astronomi
521 Celest mekanik
pt
520 Astronomia
521 Mecânica celestial
ru
520 Астрономия
521 Небесная механика
zh
520 天文学
521 天体力学
ar
520 علم الفلك.
521 ميكانيكا الأجرام الفلكية.
af
520 Sterrekunde
521 Fisiese sterrekunde
no
520 Astronomi
521 Celest mekanikk
de
520 Astronomie
521 Himmelsmechanik
gd
520 Reul-eòlas
521 Meacanaigs nan speuran
Dewey Decimal Classification
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