52816
A star 's direction remains nearly fixed due to its vast distance , but its right ascension and declination do change gradually due to precession of the equinoxes and proper motion , and cyclically due to annual parallax .
 star
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:
 star