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proljetna ravnodnevica

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 also called the march equinox and the first point of aries.

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  • Pramonės šaka / sritis: Astronomy
  • Category: Mars
  • Company: NASA
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The position on the ecliptic occupied by the sun about december 22 when it reaches its greatest southerly declination.

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

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The gaseous envelope surrounding a celestial body.

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The straight line, real or imaginary, passing through a rotating body and is the line about which that body rotates.

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