83644
It was possible to re-program the length of day and night daily in order to account for the changing lengths of day and night throughout the year , and it also featured five robotic musicians who automatically play music when moved by levers operated by a hidden camshaft attached to a water wheel .
 night
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 night