It means literally "I need to know when the hour of Jupiter is." I suspect it is saying that if you want to see Jupiter in your telescope you need to know what hour you can see it.
"How is your day so far?" even though hasta ahora means "until now".
necessities
It means, "and now that" or, if it is phrased as ¿y ahora qué? it would mean "and now what?"
matame ahora means kill me now
Ahora es means "Now is'
ahora mismo = right now. Donde estas ahora mismo = where are you right now.
"Que vas a hacer ahora?" means "What are you going to do/make now?"
"Where are we right now?"
Translation: Not today my love
take me now
"Diciendo ahora" in English translates to "saying now" or "saying currently."
"Hacer ahora" means "do now" in English. It is used to indicate an action that needs to be done immediately or promptly.