(astronomy, mechanics) celestial mechanics

thesis; dissertation; article

a celestial body

write; record (words, figures) on the surface of (something) / compose; put (an idea, etc) into words

conjunctive form of 書く

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

mechanics (a branch of physics)

short essay