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Astronomy

How are mars years counted?

In this diagram about the methane concentration in the martian atmosphere, there are data points labeled "Mars year 32", "Mars year 33", and "Mars year 34". How are Mars years counted? Is there a "…
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Dictionary

Astrolabe

Astrolabe Astronomy dictionary, letter A The astrolabe is an ancient astronomical instrument probably conceived by the Greeks and used by the Arabs, the Persians and the Europeans, as a navigational aid until the 18th century, at which time it is replaced by More accurate sextant. It is composed of a metal disk that has a circumference graduated from 0O to 360O engraved on the edge; in a more inner band, a circle divided into 24 hours a day; in the central part, a projection of the celestial sphere in a plane parallel to the equator.
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Dictionary

Ceres

Ceres Dictionary of astronomy, letter C Ceres is the largest of the Asteroids or small planets and the first to have been discovered, by Giuseppe Piazzi, director of the astronomical observatory of Palermo, on January 1, 1801. It has a diameter of 1,000 km and complete a round around the Sun every 4.6 years, at an average distance of 413.
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