Substellar point | Article about substellar point by The Free Dictionary
substellar point (sub-stell -er) The point on the Earth's surface that lies directly beneath a star on the line connecting the center of Earth and star. The star would thus lie at the zenith of an observer at that point, the terrestrial latitude of which would equal the star's declination. The sublunar point and subsolar point are the equivalent points for the Moon and Sun, respectively.
substellar point[¦səb′stel·ər ′pȯint]
The geographical position of a star; that point on the earth at which the star is in the zenith at a specified time. Also known as subastral point.
The point on the earth's surface where a line joining a heavenly body to the center of the earth cuts the earth's surface. It is the geographical position of the subpoint of the body and at any particular instant.
References in periodicals archive
As a result, the hottest point on Kepler-76b isn't the substellar point
("high noon") but a location offset by about 10,000 miles.
The substellar point
of infrared resolution is 5 km.
The equilibrium temperature at the substellar point
- the equatorial part of the planet where the sun is directly overhead - approaches 2,900 degrees Kelvin, or about 2,627 degrees Celsius.