"Ah, the sun is born of night"
I'd say he's talking about the sunrise here, which is the beginning of a new day. Maybe it's a beginning? As in being born?
"It sets again"
My guess it's a sunset, which is the end of the day. So maybe that'd be the end, death?
"Ah, the sun is born of night, it sets again
Though no one's here to see - it's endless"
The cycle of life and death, and since everyone dies someday there's no one who can watch it all for eternity.
"Sad, but everybody knows
A trip to heaven’s not really on the cards, no"
He won't go to heaven, and he knows it.
"Yet my "moment" has come
A crying shame, for now my life is over"
He doesn't want to die yet, so for some reason he is dying against his will. A disease or something like that maybe?
"So perfect, this moment So perfect, this moment
I’m happy to die in this moment"
However, now is the time for him to die. Now it's okay to die, maybe he even wants it.
"I’ve been to Heaven Heaven on Earth"
He got his trip to heaven anyway? Maybe it's this "Heaven on Earth" he found that gave him what he wanted/needed to be able to be at peace with dying and becoming a part of the eternal cycle.
"Ah, the sun is born of night" I'd say he's talking about the sunrise here, which is the beginning of a new day. Maybe it's a beginning? As in being born?
"It sets again" My guess it's a sunset, which is the end of the day. So maybe that'd be the end, death?
"Ah, the sun is born of night, it sets again Though no one's here to see - it's endless" The cycle of life and death, and since everyone dies someday there's no one who can watch it all for eternity.
"Sad, but everybody knows A trip to heaven’s not really on the cards, no" He won't go to heaven, and he knows it.
"Yet my "moment" has come A crying shame, for now my life is over" He doesn't want to die yet, so for some reason he is dying against his will. A disease or something like that maybe?
"So perfect, this moment So perfect, this moment I’m happy to die in this moment" However, now is the time for him to die. Now it's okay to die, maybe he even wants it.
"I’ve been to Heaven Heaven on Earth" He got his trip to heaven anyway? Maybe it's this "Heaven on Earth" he found that gave him what he wanted/needed to be able to be at peace with dying and becoming a part of the eternal cycle.