83789
As a result of this nodal precession , the time for the Sun to return to the same lunar node , the eclipse year , is about 18.6377 days shorter than a sidereal year .
 time: sidereal year
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: sidereal year 
Answer:
 time: sidereal year