The Mayan and other Mesoamerican cultures used a vigesimal number system based on base 20 (and, to some extent, base 5), probably originally developed from counting on fingers and toes. The numerals consisted of only three symbols: zero, represented as a shell shape; one, a dot; and five, a bar.
The another name for the equatorial coordinate system is B. Celestial.
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'' Ecosystem ,the fabric of life on which we all depand and enjoying the life peacefully . Are declining rapidly beacuse of human activites . But still time to save them .
