The subsolar point at Honolulu during Lahaina Noon with the range of possible subsolar points shaded in pink – the angle between the Sun and the local horizontal level is exactly 90° at the subsolar point
The subsolar point on a planet 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. It can also mean the point closest to the Sun on an astronomical object, even though the Sun might not be visible.
To an observer on a planet with an orientation and rotation similar to those of Earth, the subsolar point will appear to move westward with a speed of 1600 km/h, completing one circuit around the globe each day, approximately moving along the equator. However, it will also move north and south between the tropics over the course of a year, so will appear to spiral like a helix.
The subsolar point contacts the Tropic of Cancer on the June solstice and the Tropic of Capricorn on the December solstice. The subsolar point crosses the Equator on the March and September equinoxes.
^Ian Ridpath, ed. (1997). "subsolar point". A Dictionary of Astronomy. Oxford; New York: Oxford University Press. ISBN 0-19-211596-0. The point on the Earth, or other body, at which the Sun is directly overhead at a particular time.
The subsolarpoint on a planet is the point at which its Sun is perceived to be directly overhead (at the zenith); that is, where the Sun's rays strike...
solstice the subsolarpoint is further south than any other time: at latitude 23.44° south, known as the Tropic of Capricorn. The subsolarpoint will cross...
\phi _{s}} is the latitude of the subsolarpoint, λ s {\displaystyle \lambda _{s}} is the longitude of the subsolarpoint, T G M T {\displaystyle T_{\mathrm...
latitudes and longitudes, or coordinates, of the subsolarpoint and the observer's point, then the upward-pointing unit vectors at the two points, S {\displaystyle...
culminates at the zenith at solar noon, passing directly overhead (above the subsolarpoint). As a result, the sun's rays will fall exactly vertical relative to...
times when the subsolarpoint is on the equator, meaning that the Sun is exactly overhead at a point on the equatorial line. The subsolarpoint crosses the...
(or the Southern Tropic) is the circle of latitude that contains the subsolarpoint at the December (or southern) solstice. It is thus the southernmost...
year. On the equinoxes (approximately March 20 and September 23) the subsolarpoint crosses Earth's equator at a shallow angle, sunlight shines perpendicular...
March equinox or northward equinox is the equinox on the Earth when the subsolarpoint appears to leave the Southern Hemisphere and cross the celestial equator...
means that the tropical zone includes everywhere on Earth which is a subsolarpoint at least once during the solar year. Thus the maximum latitudes of the...
day). The shadow points towards Mecca because the Sun path makes the subsolarpoint travel through every latitude between the Tropic of Cancer and the Tropic...
Mathematical setup, application and extension of a formula based on the subsolarpoint and atan2 function. Renewable Energy, 172, 1333-1340. DOI: https://doi...
Azimuth Geodesy History of geodesy Horizon zenith angle Keyhole problem Subsolarpoint Vertical deflection Horizontal coordinate system Analemma Jones, Daniel...
Mathematical setup, application and extension of a formula based on the subsolarpoint and atan2 function. Renewable Energy, 172, 1333-1340. DOI: https://doi...
Mathematical setup, application and extension of a formula based on the subsolarpoint and atan2 function. Renewable Energy, 172, 1333-1340. DOI: https://doi...
Pole, so its declination would be +90°. For the next few months, the subsolarpoint would move toward the South Pole at constant speed, crossing the circles...
Mathematical setup, application and extension of a formula based on the subsolarpoint and atan2 function". Renewable Energy. 172: 1333–1340. doi:10.1016/j...
Mathematical setup, application and extension of a formula based on the subsolarpoint and atan2 function". Renewable Energy. 172. Elsevier BV: 1333–1340....
The shadow of a sundial moves clockwise on latitudes north of the subsolarpoint and anticlockwise to the south. During the day at these latitudes, the...
elapsed between observations of the same point on Earth by a satellite Satellite watching, as a hobby Subsolarpoint Terminator (solar), the moving line that...
a unit of volume) of 3×1011 m−3 is reached in the v2 layer near the subsolarpoint. The upper boundary of the ionosphere (the ionopause) is located at...
In contrast to older reconstructions, most recent TSI reconstructions point to an increase of only about 0.05% to 0.1% between the 17th century Maunder...
diagonal but due east). The midpoint of the eclipse being near the subsolarpoint (the part of Earth closest to the Sun). The longest eclipse that has...
observed directly overhead from outside of the tropics. Thermal equator Subsolarpoint "Climate and Currents". Retrieved 4 March 2011. "What Is a Solstice...
locked body on the sunlit side. This ratio would be 1 for the subsolarpoint, the point on the planet directly below the sun and gives the maximum temperature...
After then, the center of the Sun at the high point, the zenith, of the sky (which makes for the subsolarpoint beneath) aligns with successive latitudes...
100 RJ (where RJ=71,492 km is the radius of Jupiter) at the subsolarpoint—the unfixed point on the surface at which the Sun would appear directly overhead...
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