Virgo or Libra, depending on who you ask.
On September 30, 2010, Jupiter was in the constellation of Pisces.
september
september to october
It is best seen at 9pm EST in September.
No. For the Sun to be "in" one of the constellations means that the constellation is BEHIND the Sun, and so invisible. Any constellation is, on average, visible for 9 months of the year, with the 3 months of non-visibility being centered on that constellation.
Acording to Wikipedia - It's visible during September.
The best month to see the constellation Delphinus is typically in late summer to early fall, around August to September. This is when the constellation is highest in the sky and most visible during the evening hours.
Jupiter was in the constellation of Pisces on September 21, 2010. It would have been visible in the eastern sky during the evening hours.
The Sun will begin to rise in the foreground of the constellation Aquarius starting September 21st. History has marked this day as the first of "the Age of Aquarius." Interestingly the Mayan Pyramids of Chichen itza as well as Stonehenge are both known to contain lines of sight that mark when these days come about.
The Pavo constellation is best seen in the Southern Hemisphere during the months of July and August. It is most prominent in the night sky during these months.
Virgo is the largest constellation in the zodiac and second largest constellation overall. It occupies an area of 1294 square degrees.
The Pisces constellation can typically be seen in the night sky during the autumn and winter months in the northern hemisphere, and during summer in the southern hemisphere. It is located near the constellation of Aquarius. Pisces is best observed in late evening to early morning hours when the sky is dark and clear.