These lines mean that Romeo is comparing Juliet to the sun. Juliet is the sun that brightens any darkness. The moon should be envious of her beauty. These are metaphors. But, soft! what light through yonder window breaks? It is the east, and Juliet is the sun. Arise, fair sun, and kill the envious moon, Who is already sick and pale with grief
Juliet wonders why Romeo must be a Montague. She says she will love him if he disowns his family or that she will disown her family if he asks her to. O Romeo, Romeo! wherefore art thou Romeo? Deny thy father and refuse thy name; Or, if thou wilt not, be but sworn my love, And I'll no longer be a Capulet.
The features of a rose and Romeo would still be the same if they had different names. A name doesn’t make a person or his/her characteristics. What's in a name? that which we call a rose By any other name would smell as sweet;
They will meet at 9 a.m. if Romeo is being true and honest, and if he intends to marry her.