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Lahaina Noon

Tropical solar phenomenon

Lahaina Noon

Summary

Tropical solar phenomenon

level]] photographed during Lāhainā Noon in Hawaii
Students performing an experiment on a zero shadow day in [[Tamil Nadu

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. As a result, the sun's rays will fall exactly vertical relative to an object on the ground and cast no observable shadow. 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. The term "Lāhainā Noon" was initiated by the Bishop Museum in Hawaii.

Details

The subsolar point at Honolulu during Lahaina Noon with the range of possible subsolar points shaded in purple – the angle between the Sun and the local horizontal level is exactly 90° at the subsolar point

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. 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.

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. The ancient Hawaiian name for the event was kau ka lā i ka lolo which translates as "the sun rests on the brains."

Subsolar dates

References

References

  1. (December 31, 2008). "Clock, sun rarely match at noon".
  2. Newsd. (2019-04-24). "Zero Shadow Day 2019: Date, time & know why you cannot see your shadow".
  3. (2017-04-07). "Zero Shadow Day".
  4. "Lāhainā Noon".
  5. (May 23, 2001). "'Lahaina Noon' coming here soon". [[Honolulu Star-Bulletin]].
  6. {{Hawaiian Dictionaries. Lā-hainā. D48691
  7. Nancy Alima Ali. (May 11, 2010). "Noon sun not directly overhead everywhere". [[Honolulu Star-Bulletin]].
  8. {{Hawaiian Dictionaries. Lolo
  9. (May 27, 2006). "Newswatch: Shadows disappear today at Lahaina noon". Honoluu Star-Bulletin.
  10. Kaichi, Carolyn. (April 29, 2007). "Earth at prime tilt to view Mercury at apex". Honolulu Advertiser.
  11. Miura, Kelli. (July 11, 2008). "Lahaina Noon flits over Honolulu on Tuesday". Honolulu Advertiser.
  12. (July 15, 2008). "Liliha Library to host 'Lāhainā Noon,' 'StarLab' astro events". Honolulu Advertiser.
  13. Keany, Michael. (June 30, 2008). "Skygate".
  14. Adams, Wanda A.. (June 26, 2005). "'Lāhainā Noon' about a warm, clear feeling". Honolulu Advertiser.
  15. (October 29, 2006). "Ka Palapala Po'okela winners named". Honolulu Advertiser.
  16. Nakaso, Dan. (May 26, 2011). "Shadow lessons: Educators will show kids and adults the marvels of a Lahaina Noon event". Honolulu Star-Advertiser.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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