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20
astronomy
9
positional astronomy
6
astrology
6
geometry
6
mathematics
6
celestial mechanics
5
astronomical instruments
5
time measurement
4
optics
3
chronology
3
spherical trigonometry
3
sundial
2
arithmetic
2
astrometry
2
calendar (astronomy)
2
classical mechanics
2
cosmology
2
planets
2
geographical position
1
Moon
1
analytical geometry
1
analytical mechanics
1
applied mathematics
1
ephemerides
1
ecliptic
1
phases of the Moon
1
geography
1
geometrical optics
1
geometric constructions
1
globes
1
stars
1
cartography
1
magnetism
1
maps
1
microscopes
1
moons
1
altitude
1
sea navigation
1
surface area
1
optic instruments
1
solar system
1
steganography
1
stellar astronomy
1
light
1
theory
1
theory of light
1
universe
1
military buildings
1
lenses
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