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The point of the celestial sphere directly overhead, 90 degrees above the horizon, for any point on earth; it is the point where a plumb line extended upward would intersect the celestial sphere.

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Kalbos dalis: noun
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Pramonės šaka / sritis: Astronomy
Category: Mars
Company: NASA
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Astronomy; Mars

The position on the ecliptic occupied by the sun about december 22 when it reaches its greatest southerly declination.

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Astronomy; Mars

The position on the celestial sphere occupied by the sun on or about march 21 when its path on the ecliptic crosses the celestial equator going from south to north. This point is ...

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Astronomy; Mars

The invisible electromagnetic radiation beyond the violet end of the spectrum of visible light, of wavelengths ranging, roughly, from 4000 down to 400 angstroms.

Mars

Astronomy; Mars

Mars is the fourth planet from the Sun. Mars' diameter is 6,790 km and takes 687 days to orbit the Sun. Mars is named after the Roman god of war. In Eastern Asian cultures Mars is ...

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Astronomy; Mars

The gaseous envelope surrounding a celestial body.

astronomska jedinica (AJ)

Astronomy; Mars

A measure for distances within the solar system, equal to the mean ditance of the earth from the sun, which is about 93,000,000 miles.

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