Dynamical equinox

Dynamical equinox

The ascending node of the Earth's orbit; i.e., that intersection of the celestial equator with the ecliptic at which the Sun's declination is changing from south to north.

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Part of Speech: noun
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Industry/Domain: Earth science
Category: Mapping science
Company: American Congress on Surveying & Mapping
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Related terms

dynamical equinox

Earth science; Mapping science

The ascending node of the Earth's orbit; i.e., that intersection of the celestial equator with the ecliptic at which the Sun's declination is changing from south to north.

equinox

Astronomy; General astronomy

Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. Due to ...

equinox

Natural environment; Coral reefs

Either of the two times during a year when the sun crosses the celestial equator and the length of day and night are equal.

equinox

Science; Basic science

Either of the two times during the year when the Sun is directly above the equator and daylight and night are the same length.

equinox

Chemistry; Weather; Atmospheric chemistry

Twice during the year, September 21 and March 21, the length of day and night are equal because the tilt of the Earth's axis (in relationship to the sun) is nullified and both the ...

equinox

Energy; Solar power

The two times of the year when the sun crosses the equator and night and day are of equal length; usually occurs on March 21st (spring equinox) and September 23 (fall equinox).

subtropical

Earth science; Mapping science

Relating to the warmest region of the Temperate Zones that border on the Torrid Zone.

sky

Earth science; Mapping science

The region above and beyond the Earth, as it is seen looking up from the ground. Sky looks blue during the day and dark at night.

South Pole

Earth science; Mapping science

The most southern point of the Earth. The South Pole is the southern end of the axis on which the Earth rotates.

prime meridian

Earth science; Mapping science

The line of longitude that passes through the town of Greenwich, England, and that measures 0 degree. It is the line from which other longitude lines are measured.

planet

Earth science; Mapping science

A celestial body revolving around a sun in a nearly circular orbit. This definition excludes comets, which have highly elliptical orbits. However, it may also exclude some of ...

area of error

Earth science; Mapping science

A figure within which the true location of a point whose location has been determined by measurement is believed to lie, with stated degree of probability.