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 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.[3] The term "Lāhainā Noon" was initiated by the Bishop Museum in Hawaiʻi.[4]
- ^ "Clock, sun rarely match at noon". Honolulu Star-Bulletin. December 31, 2008. Archived from the original on July 17, 2023. Retrieved July 16, 2023.
- ^ Newsd (2019-04-24). "Zero Shadow Day 2019: Date, time & know why you cannot see your shadow". News and Analysis from India. A Refreshing approach to news. Retrieved 2019-08-22.
- ^ "Zero Shadow Day". ASI POEC. 2017-04-07. Retrieved 2019-08-22.
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