| Tenmondo (ancient horoscopy) is an ancient study involving the observation and recording of unusual astronomical phenomena (extraordinary astronomical events/extraordinary natural phenomena) and investigation of their effects on the Earth. |
天文道（てんもんどう）とは、天文現象の異常（天文異変/天変現象）を観測・記録し、その地上への影響について研究する古代の学問。 |