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The subsolar point on a planet or a moon is the point at which its Sun is perceived to be directly overhead (at the zenith); [1] that is, where the Sun's rays strike the planet exactly perpendicular to its surface. The subsolar point occurs at the location on a planet or a moon where the Sun culminates at the location's zenith. This occurs at ...
While the formula can be derived by applying the cosine law to the zenith-pole-Sun spherical triangle, the spherical trigonometry is a relatively esoteric subject.. By introducing the coordinates of the subsolar point and using vector analysis, the formula can be obtained straightforward without incurring the use of spherical trigonometry.
A 2021 publication presents a method that uses a solar azimuth formula based on the subsolar point and the atan2 function, as defined in Fortran 90, that gives an unambiguous solution without the need for circumstantial treatment. [7] The subsolar point is the point on the surface of the Earth where the Sun is overhead.
Spherical triangle for application of the spherical law of cosines for calculating the solar zenith angle Θ of an observer at latitude φ and longitude λ, using the hour angle h and solar declination δ (where δ is latitude of subsolar point, and h is relative longitude of 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. [ 5 ] In 2022 and 2023, the phenomenon occurred in Honolulu on May 26 and July 16. [ 4 ]
A Law Reference Collection, 2011, ISBN 1624680003 and ISBN 978-1-62468-000-7; Trinxet, Salvador. Trinxet Reverse Dictionary of Legal Abbreviations and Acronyms, 2011, ISBN 1624680011 and ISBN 978-1-62468-001-4. Raistrick, Donald. Index to Legal Citations and Abbreviations. 3rd ed. London: Sweet & Maxwell, 2008. This book focuses more on British ...
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The distance from Earth to the subsolar magnetopause varies over time due to solar activity, but typical distances range from 6–15 R. Empirical models [8] [9] using real-time solar wind data can provide a real-time estimate of the magnetopause location. A bow shock stands upstream from the magnetopause. It serves to decelerate and deflect the ...