| 434 / | HD | EDUCATION AND DEMONSTRATION |
| 276 | DF | SCIENCE {9} |
| 284 | DF | .~ Astronomy {1} |
| 285 | ![]() | .~.~ Representation of light generating celestial body {4} |
| 286 | DF | .~.~.~> Light spot |
| 287 | DF | .~.~.~> Celestial globe {1} |
| 289 | DF | .~.~.~> Finding or identifying aid |
| 290 | DF | .~.~.~> Simulation of sun and earth {2} |