retrogradno kretanje

retrogradno kretanje

Backward (westward) motion of the planet among the stars, resulting from the fact that it is viewed from the moving earth. It is the motion that a planet has when its right ascension is decreasing. Each year, when Earth passes a superior planet, such as Mars, the planet appears to move backward for a short time. It is the same effect you see when two trains are running in the same direction on side by side tracks. The slower train appears to be moving backward.

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Part of Speech: noun
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Industry/Domain: Astronomy
Category: Mars
Company: NASA
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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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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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