Definition: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: Which of the places where Gill observed the planets has a larger population? Passage 1:It would seem that Gill's interests lay elsewhere since after a few years he sold the business, and then spent time equipping Lord Lindsay's private observatory at Dun Echt, Aberdeenshire. In 1874, Gill joined the expedition to Mauritius to observe the transit of Venus. Three years later he went to Ascension Island to observe a near approach of Mars and to calculate its distance. While carrying out these laborious calculations, he was notified of his appointment to the Cape Observatory, which, over the following 27 years he was to refurbish completely, turning it into a first-rate institution. Gill was a meticulous observer and had a flair for getting the best out of his instruments. His solar parallax observations with a heliometer and his calculations of distances to the nearer stars, are testimony to his outstanding work. He recruited Robert Innes to the Cape Observatory.
 Passage 2:Irish stars Jimmy Clausen and Golden Tate chose to forgo their final years of eligibility and declare for the 2010 NFL draft. The Irish also lost a number of seniors to graduation, including linemen Eric Olsen, Paul Duncan and four-year starter Sam Young. Other notable losses included running back James Aldridge, wideout Robby Parris, and George West on offense. On defense, ND lost senior captains Kyle McCarthy and Scott Smith, Raeshon McNeil, Sergio Brown, John Ryan and Ray Herring to graduation. Standout special teams player Mike Anello also finished his final year of eligibility. Sophomore defensive back E.J Banks left the team in August 2010, but will still be enrolled at the school. On August 31, within days of the September 4 season opener against Purdue, sophomore wide receiver Shaquelle Evans was granted his release from the team, and decided to enroll at UCLA. Freshman Derek Roback also left the program in early September, as his desire to play quarterback led to his transfer to Ohio
 Passage 3:Terrell's career began as a teenager, first recording for Scepter/Wand Records, before spending nearly two years as a member of James Brown's Revue, recording for Brown's Try Me label. After a period attending college, Terrell recorded briefly for Checker Records, before signing with Motown in 1965. With Gaye, Terrell scored seven Top 40 singles on the Billboard Hot 100, including "Ain't No Mountain High Enough" which was inducted into the Grammy Hall of Fame in 1999, "Ain't Nothing Like the Real Thing" and "You're All I Need to Get By". Terrell's career was interrupted when she collapsed into Gaye's arms as the two performed at a concert at Hampden–Sydney College on October 14, 1967, with Terrell later being diagnosed with a brain tumor. She had eight unsuccessful surgeries before succumbing to the illness on March 16, 1970 at the age of 24.

Output:
1