астрометрия

астрометрия

The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow astronomers to determine the distances and velocities of the stars.

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Settore/Dominio: Astronomia
Categoria: Astronomia (generale)
Company: Caltech
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Acronimo - Abbreviazione:

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Astronomia; Astronomia (generale)

One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's ...

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Astronomia; Astronomia (generale)

Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are ...

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Astronomia; Astronomia (generale)

Trojan asteroid (60° ahead of Jupiter. It was the first Trojan to be discovered.

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Astronomia; Astronomia (generale)

The number of protons in an atom's nucleus. This determines the type of element.

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Astronomia; Astronomia (generale)

the light produced by excited atoms and ions in the upper atmosphere of a planet

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Astronomia; Astronomia (generale)

1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. 2) Directional ...

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The most important of the traditional Chinese holidays, Chinese New Year represents the official start of the spring, beginning on the first day of ...