timekeeping

2026년 8월 29일

• dipleidoscope
• true-noon
• meridian
• solar-image
• prism
• timekeeping
• optical-coincidence

2026년 7월 22일

• sundial-cannon
• cannon-dial
• solar-time
• public-time-signal
• scientific-instrument
• timekeeping
• sound-signal
• local-time

2026년 7월 11일

• history-of-technology
• timekeeping
• incense-clock
• material-computation
• sensory-history
• combustion
• east-asian-history
• ritual-technology