:Lahaina Noon

{{short description|Tropical solar phenomenon}}

File:Lahaina Noon.jpg photographed during Lāhainā Noon in Hawaii]]

File:Zero shadow day 2.jpg]]

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.{{Cite web |date=December 31, 2008 |title=Clock, sun rarely match at noon |url=https://archives.starbulletin.com/content/20081231_Clock_sun_rarely_match_at_noon.html |url-status=live |archive-url=https://web.archive.org/web/20230717003910/https://archives.starbulletin.com/content/20081231_Clock_sun_rarely_match_at_noon.html |archive-date=July 17, 2023 |access-date=July 16, 2023 |website=Honolulu Star-Bulletin}} As a result, the sun's rays will fall exactly vertical relative to an object on the ground and cast no observable shadow.{{Cite web |last=Newsd |date=2019-04-24 |title=Zero Shadow Day 2019: Date, time & know why you cannot see your shadow |url=https://newsd.in/zero-shadow-day-2019-date-time-know-why-you-cannot-see-your-shadow/ |access-date=2019-08-22 |website=News and Analysis from India. A Refreshing approach to news. |language=en-US}} When this occurs at a given location, the location is Earth's subsolar point. A zero shadow day occurs twice a year for locations in the tropics (between the Tropic of Cancer at approximate latitude 23.4° N and the Tropic of Capricorn at approximately 23.4° S) when the Sun's declination becomes equal to the latitude of the location, so that the date varies by location.{{Cite web |date=2017-04-07 |title=Zero Shadow Day |url=https://astron-soc.in/outreach/activities/zero-shadow-day/ |access-date=2019-08-22 |website=ASI POEC |language=en-US}} The term "Lāhainā Noon" was initiated by the Bishop Museum in Hawaii.

Details

File:Lahaina_noon_subsolar_point.svg

The subsolar point travels through the tropics. Hawaii is the only US state in the tropics and thus the only one to experience Lāhainā Noon. In 2022 and 2023, the phenomenon occurred in Honolulu on May 26 and July 16.{{cite web |url=https://www.bishopmuseum.org/lahaina-noon/ |title=Lāhainā Noon |website=Bishop Museum |access-date=August 3, 2022 }} 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 12:43pm 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 Hawaii encountered the overhead sun around May 18 and July 24, Kahului, Maui, on May 24 and July 18, Honolulu, Oahu, on May 26 and July 15 and Lihue, Kauai, on May 31 and July 11. Between each pair of dates, the sun is slightly to the north at solar noon.{{cite news |title= 'Lahaina Noon' coming here soon |date= May 23, 2001 |newspaper= Honolulu Star-Bulletin |url= http://archives.starbulletin.com/2001/05/23/news/story12.html |access-date= November 12, 2010 }}

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.{{Hawaiian Dictionaries |Lā-hainā |D48691 |q=Lahaina |dic=pp |access-date= November 12, 2010 }} The ancient Hawaiian name for the event was kau ka lā i ka lolo which translates as "the sun rests on the brains."{{cite news |title= Noon sun not directly overhead everywhere |author= Nancy Alima Ali |date=May 11, 2010 |newspaper= Honolulu Star-Bulletin |url= http://archives.starbulletin.com/content/20100511_Noon_sun_not_directly_overhead_everywhere/ |access-date= November 12, 2010 }}{{Hawaiian Dictionaries |Lolo |exact=yes |access-date= May 26, 2011 }}{{Clear|left}}

=Subsolar dates=

{{subsolar_point_date_graph.svg}}

= Gallery =

File:Shadows during Lahaina Noon (5767078745).jpg|Lāhainā Noon in Downtown Honolulu

File:Sky Gate by Isamu Noguchi.jpg|Sky Gate by Isamu Noguchi

See also

  • {{anli|Qibla observation by shadows}}
  • {{anli|Sundial}}

References

{{Reflist}}

Further reading

  • {{Cite book |last=Pruitt |first=B. |date=2002 |title=Explore Kauai |publisher=Mutual Publishing |isbn=1-56647-560-0 |page=17 }}
  • {{Cite news |first=Jack |last=Williams |url=https://www.usatoday.com/weather/resources/basics/sun-overhead.htm |title=Sun beams directly down on Hawaii in May, July |newspaper=USA Today |date=May 17, 2005 }}