Astronomy:Lahaina Noon
Lāhainā Noon, also known as a zero shadow day, is a semi-annual tropical solar phenomenon when the Sun culminates at the zenith at solar noon, passing directly overhead (above the subsolar point).[1] As a result, the sun's rays will fall exactly vertical relative to an object on the ground and cast no observable shadow.[2] A zero shadow day occurs twice a year for locations in the tropics (between the Tropic of Cancer at latitude 23.4° N and the Tropic of Capricorn at 23.4° S) when the Sun's declination becomes equal to the latitude of the location, so that the date varies by location.[3] The term "Lāhainā Noon" was coined by the Bishop Museum in Hawaiʻi.[4]
Details
The subsolar point travels through the tropics. Hawaiʻi is the only US state in the tropics and thus the only one to experience Lāhainā Noon.[5] In 2022 and 2023, the phenomenon occurred in Honolulu on May 26 and July 16.[4] Hawaii and other locations between the Tropic of Cancer and Tropic of Capricorn receive the sun's direct rays as the apparent path of the sun passes overhead before and after the summer solstice.
Lāhainā Noon can occur anywhere from 12:16 to 12:43 p.m. Hawaii–Aleutian Standard Time. At that moment objects that stand straight up (flagpoles, bollards, telephone poles, etc.) cast no outward shadow. The most southerly points in Hawaii experience Lāhainā Noon on earlier and later dates than the northern parts. For example, in 2001 Hilo on the Island of Hawaiʻi encountered the overhead sun around May 18 and July 24, Kahului, Maui, on May 24 and July 18, Honolulu, Oʻahu, on May 26 and July 15 and Līhuʻe, Kauaʻi, on May 31 and July 11. Between each pair of dates, the sun is slightly to the north at solar noon.[6]
Chosen in a contest sponsored by the Bishop Museum in the 1990s, Lāhainā Noon was the selected appellation because lā hainā (the old name for Lāhainā, Hawaii) means "cruel sun" in the Hawaiian language.[7] The ancient Hawaiian name for the event was kau ka lā i ka lolo which translates as "the sun rests on the brains."[5][8]
Subsolar dates
In popular culture
The event is often covered by Hawaiʻi media.[5][9][10][11] Activities are associated with the event.[12]
Sky Gate, a unique sculpture in Honolulu created by world-renowned artist and landscape architect Isamu Noguchi, features a bendy, bumpy ring that drastically changes height as it goes around. Most of the year, it makes a curvy, twisted shadow on the ground, but during Lāhainā Noon, the height-changing ring casts a perfect circular shadow on the ground.[13] There are often activities held by the City & County of Honolulu around the time of the event on the Frank Fasi Civic Grounds, where the sculpture is located.
The phenomenon occurs in stories, including "Lāhainā Noon" by Eric Paul Shaffer (Leaping Dog, 2005),[14] which won the Ka Palapala Po'okela book award for Excellence in "Aloha from beyond Hawai'i".[15][16]
Gallery
Lāhainā Noon in Downtown Honolulu
Sky Gate by Isamu Noguchi
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See also
References
- ↑ "Clock, sun rarely match at noon". December 31, 2008. https://archives.starbulletin.com/content/20081231_Clock_sun_rarely_match_at_noon.html.
- ↑ Newsd (2019-04-24). "Zero Shadow Day 2019: Date, time & know why you cannot see your shadow" (in en-US). https://newsd.in/zero-shadow-day-2019-date-time-know-why-you-cannot-see-your-shadow/.
- ↑ "Zero Shadow Day" (in en-US). 2017-04-07. https://astron-soc.in/outreach/activities/zero-shadow-day/.
- ↑ 4.0 4.1 "Lāhainā Noon". https://www.bishopmuseum.org/lahaina-noon/.
- ↑ 5.0 5.1 5.2 Nancy Alima Ali (May 11, 2010). "Noon sun not directly overhead everywhere". Honolulu Star-Bulletin. http://archives.starbulletin.com/content/20100511_Noon_sun_not_directly_overhead_everywhere/.
- ↑ "'Lahaina Noon' coming here soon". Honolulu Star-Bulletin. May 23, 2001. http://archives.starbulletin.com/2001/05/23/news/story12.html.
- ↑ Mary Kawena Pukui, Samuel Hoyt Elbert and Esther T. Mookini (2004). "lookup of Lā-hainā ". in Place Names of Hawai'i. Ulukau, the Hawaiian Electronic Library, University of Hawaii Press. http://wehewehe.org/gsdl2.85/cgi-bin/hdict?a=q&j=pp&l=en&q=Lahaina&a=d&d=D48691.
- ↑ Mary Kawena Pukui and Samuel Hoyt Elbert (2003). "lookup of Lolo". in Hawaiian Dictionary. Ulukau, the Hawaiian Electronic Library, University of Hawaii Press. http://wehewehe.org/gsdl2.85/cgi-bin/hdict?a=q&j=pk&l=en&q=Lolo&af=0.
- ↑ "Newswatch: Shadows disappear today at Lahaina noon". Honoluu Star-Bulletin. May 27, 2006. http://archives.starbulletin.com/2006/05/27/news/briefs.html.
- ↑ Kaichi, Carolyn (April 29, 2007). "Earth at prime tilt to view Mercury at apex". Honolulu Advertiser. http://the.honoluluadvertiser.com/article/2007/Apr/29/ln/FP704290342.html.
- ↑ Miura, Kelli (July 11, 2008). "Lahaina Noon flits over Honolulu on Tuesday". Honolulu Advertiser. http://the.honoluluadvertiser.com/article/2008/Jul/11/ln/hawaii807110348.html.
- ↑ "Liliha Library to host 'Lāhainā Noon,' 'StarLab' astro events". Honolulu Advertiser. July 15, 2008. http://the.honoluluadvertiser.com/article/2008/Jul/15/br/hawaii307150006.html.
- ↑ Keany, Michael (June 30, 2008). "Skygate". Honolulu magazine. http://www.honolulumagazine.com/Honolulu-Magazine/July-2008/Skygate/. Retrieved September 9, 2020.
- ↑ Adams, Wanda A. (June 26, 2005). "'Lāhainā Noon' about a warm, clear feeling". Honolulu Advertiser. http://the.honoluluadvertiser.com/article/2005/Jun/26/il/il07a.html.
- ↑ "Ka Palapala Po'okela winners named". Honolulu Advertiser. October 29, 2006. http://the.honoluluadvertiser.com/article/2006/Oct/29/il/FP610290335.html.
- ↑ Nakaso, Dan (May 26, 2011). "Shadow lessons: Educators will show kids and adults the marvels of a Lahaina Noon event". Honolulu Star-Advertiser. http://www.staradvertiser.com/news/20110526__SHADOW_LESSONS.html.
Further reading
- Pruitt, B. (2002). Explore Kauai. Mutual Publishing. p. 17. ISBN 1-56647-560-0.
- Williams, Jack (May 17, 2005). "Sun beams directly down on Hawaii in May, July". USA Today. https://www.usatoday.com/weather/resources/basics/sun-overhead.htm.
External links
- Annual Astronomy Highlights link has current "Lahaina Noon" dates updated by the Bernice P. Bishop Museum
- Picture of "Lahaina Noon" by the Honolulu Star-Bulletin, note the street sign
- Picture of "Lahaina Noon" by the Honolulu Star-Bulletin
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