{"nrhp_refnum":"91002051","name":"Vassar College Observatory","other_names":[],"category":"building","location":{"address":"Raymond Ave.","address_restricted":false,"city":"Poughkeepsie","county":"Dutchess County","state":"NY","lat":41.68828786800006,"lon":-73.89329499624858,"geom_source":"nps_gis"},"listed_date":"1991-07-17","is_nhl":true,"nhl_designated_date":"1991-07-17","areas_of_significance":["Education","Science"],"significance_levels":["national"],"summary":{"what_it_is":"A brick observatory building on the Vassar College campus on Raymond Avenue in Poughkeepsie, New York, built in 1865 for astronomer Maria Mitchell, with a central domed octagon and three wings that also held her residence.","why_significant":"The nomination argues it is nationally significant for its link to Maria Mitchell, the first woman professor of astronomy in the country, and for its role in science and women's higher education. It was her home, laboratory and classroom from 1865 to 1888, and it was designed specifically for student use.","narrative":"Built in 1865 on a hill at Vassar College in Poughkeepsie, this brick observatory was constructed by Matthew Vassar for astronomer Maria Mitchell. It has an octagonal center 26 feet across, topped by a pine-ribbed, tin-covered dome, with three two-story wings holding the clock, chronograph, transit and prime vertical rooms. Five stone piers, isolated from the walls and floors, supported the instruments. The north wing and part of the basement were Mitchell's home, which she shared with her father. Mitchell, the first woman professor of astronomy in the country, taught, researched and lived here from 1865 to 1888. She observed Jupiter, Saturn and the sun, and became a leading advocate for women's education, inspiring students who went on to scientific careers. The building was designed for practical student use and has changed little since her time. Its telescope went to the Smithsonian in the twentieth century, and the building now serves as a general academic building and classrooms.","period_of_significance":"1865 to 1889","architect_builder":"Charles S. Farrar, scientific design; William Harloe, Builder","architectural_style":"Observatory","criteria":["A","B"],"status_note":"Used as a general academic building and classrooms, with some rooms serving as a college resource center; no longer used for teaching astronomy. The original telescope is now at the Smithsonian.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.796773-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/91002051_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/91002051/6773f8ad7d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/91002051/6773f8ad7d-1600.webp","licence":"CC BY 4.0","author":"Collin Knopp-Schwyn","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Vassar_College_Observatory,_March_2014.jpg\" rel=\"noopener\">Collin Knopp-Schwyn</a>, <a href=\"https://creativecommons.org/licenses/by/4.0\" rel=\"license noopener\">CC BY 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Vassar_College_Observatory,_March_2014.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75315696","wikipedia":"https://en.wikipedia.org/wiki/Vassar_College_Observatory","wikidata":"https://www.wikidata.org/wiki/Q7916909"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/dutchess-county/vassar-college-observatory-91002051/"}