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253:, built in 1916 by the University of Arizona at Tucson. Since that time, several other observatories have been built and maintained in Arizona. Among these are; the Northern Arizona University and U.S. Naval Observatories in Flagstaff, the National Center for Optical Astronomy, established in 1957 at
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were inconclusive, the five year study, using data from both
Harquahala Peak and Mt. Montezuma, indicated that the amount of energy reaching the Earth from the Sun was constant over the Earth's surface. In order to gain easier access and better atmospheric conditions, the Harquahala Peak Observatory
302:"Arizona, with its high frequency of clear and cloud-free days and nights, is increasingly referred to as the 'world-wide capital' of astronomical research. The significance of astronomy in Arizona can be traced from historical sites, such as Harquahala Peak Observatory"
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The location "was picked because of its remoteness from pollution, and for the region's high percentage of cloudless days. Solar observations began on
October 3, 1920, and for five years, measurements of the solar constant were taken at the site. The equipment used was a
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two-story building built with wooden beams, but it appears fragile due to it being covered with corrugated tin roof and siding. It has a wooden second-story porch. A "cement water catchment device" is on its northern end.
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measurement, which has since been abandoned as a method, was used to determine the effect of the Sun's energy output on the Earth's climate. Although results concerning
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272:. Harquahala Peak Observatory is of national significance for its contribution to the developing science of astrophysics."
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295:. It overlooks semi-arid plains at elevation 1,500–2,000 feet (460–610 m). It is currently owned by the
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245:"Two observatories had been built prior to the Harquahala Peak station. Both are still in operation; the
229:, an early device used to measure the Sun's energy output in ergs per second per square centimetre. The
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It was deemed significant as representing "an early phase in the development of
American
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363:"National Register of Historic Places Inventory/Nomination: Harquahala Peak Observatory"
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The much-deteriorated observatory, along with 10 acres (4.0 ha), was listed on the
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University and college buildings listed on the
National Register of Historic Places
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Buildings and structures on the
National Register of Historic Places in Arizona
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List of jails and prisons on the
National Register of Historic Places
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National
Register of Historic Places in La Paz County, Arizona
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in
Flagstaff, established in 1894 by Percival Lowell, and the
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in the listing. The two buildings were built in 1920 by the
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217:. Scientists staffed the observatory from 1920 to 1925.
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History of the
National Register of Historic Places
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498:List of U.S. National Historic Landmarks by state
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890:National Register of Historic Places portal
309:(at 6,883 feet (2,098 m), est. 1958) and
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189:, at elevation 5,680 feet (1,730 m) on
305:Also in Arizona, and operating in 2021 are
209:in 1975. A small storage shed was a second
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438:U.S. National Register of Historic Places
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37:U.S. National Register of Historic Places
313:(at 7,250 feet (2,210 m)est. 1894)
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331:"National Register Information System"
936:Astronomical observatories in Arizona
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259:Smithsonian Astrophysical Observatory
361:Kenneth S. White (August 10, 1973).
336:National Register of Historic Places
207:National Register of Historic Places
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853:National Historic Preservation Act
238:was moved in 1925 from Arizona to
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380:accompanying six photos from 1973
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277:Harquahala Mountains Wilderness
806:Federated States of Micronesia
452:Architectural style categories
307:Kitt Peak National Observatory
225:perhaps an alternate name for
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18:United States historic place
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187:Harquahala Peak Observatory
29:Harquahala Peak Observatory
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780:Northern Mariana Islands
123:33.812175°N 113.346906°W
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197:, United States, is an
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758:Lists by insular areas
472:Keeper of the Register
281:La Paz County, Arizona
150:10 acres (4.0 ha)
128:33.812175; -113.346906
477:National Park Service
457:Contributing property
367:National Park Service
341:National Park Service
275:It is located in the
211:contributing building
832:District of Columbia
291:off to the south of
283:, west southwest of
265:, south of Tucson."
54:Observatory in 2012.
343:. November 2, 2013.
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235:weather forecasting
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704:South Dakota
694:Rhode Island
689:Pennsylvania
669:North Dakota
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370:. Retrieved
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287:and east of
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270:astrophysics
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825:Other areas
785:Puerto Rico
619:Mississippi
534:Connecticut
126: /
113:113°20′49″W
101:Coordinates
915:Categories
734:Washington
654:New Mexico
649:New Jersey
524:California
317:References
285:Wickenburg
132: (
110:33°48′44″N
744:Wisconsin
709:Tennessee
614:Minnesota
589:Louisiana
372:April 29,
255:Kitt Peak
900:Category
729:Virginia
679:Oklahoma
659:New York
634:Nebraska
624:Missouri
609:Michigan
599:Maryland
584:Kentucky
564:Illinois
539:Delaware
529:Colorado
519:Arkansas
170:75000370
89:East of
86:Location
846:Related
749:Wyoming
724:Vermont
629:Montana
569:Indiana
549:Georgia
544:Florida
514:Arizona
504:Alabama
134:Doncram
684:Oregon
639:Nevada
579:Kansas
554:Hawaii
509:Alaska
445:Topics
289:Wenden
816:Palau
714:Texas
594:Maine
559:Idaho
378:With
199:adobe
193:near
155:Built
770:Guam
719:Utah
674:Ohio
574:Iowa
374:2021
185:The
158:1920
147:Area
93:off
279:in
261:on
242:."
165:No.
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365:.
349:^
339:.
333:.
299:.
500::
430:e
423:t
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376:.
136:)
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