| aerial survey(position, sight, outlook, standpoint) |
| air(noun, travel) |
| alidade(noun, technology, entity, form, concept) |
| almucantar(noun, technology, entity, form, concept) |
| altitude-based sundial(noun, technology, entity, form, concept) |
| analemma(noun, technology, entity, form, concept) |
| analemmatic sundial(noun, technology, entity, form, concept) |
| analytical engine(noun, technology, entity, form, concept) |
| aqua horological tintinnabulator(noun, technology, entity, form, concept) |
| arithmaurel(noun, technology, entity, form, concept) |
| arithmometer(noun, technology, entity, form, concept) |
| armillary sphere(noun, technology, entity, form, concept) |
| articulated locomotive(noun, technology, entity, form, concept) |
| astatic needle(noun, technology, entity, form, concept) |
| astrarium(noun, technology, entity, form, concept) |
| astronomical clock(noun, technology, entity, form, concept) |
| astronomical instrument(noun, technology, entity, form, concept) |
| at this point |
| automaton(noun, technology, entity, form, concept) |
| axial gnomon(noun, technology, entity, form, concept) |