Answer:
death.
Step-by-step explanation:
In this sonnet written by Shakespeare, he is speaking of times and youth gone by, and the speaker reflects upon his life as it nears death, which, amongst other figures, is symbolized by day as twilight overtakes it, and by fire that, once fueled life, now becomes ashes where the speaker will make his deathbed. As the sonnet ends, the sight of all this becomes a spectacle that the loved one will behold.