observatory (place where celestial bodies are observed)

observe

observation

star

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

probation

birdwatching

plural of 星 (hoshi): stars