Fluor & 81-day Macro & Micro Universe
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Amerindian Theorem of Time / Teorema Ameríndio do Tempo / Almanaque Amerindio del Tiempo is a mathematical method to "see" the interactions of numerical bases systems at a form of colors in antique "Amerindian" calendar systems. Time in Earth is the interaction of several types of calendars: 365, 360, 260, 117 and 40 "tropical days” among others calendars. 1 year = 365 days and after 18980 days or every 52 years a plus of 13 days is added, then after 46746 days or every 128 years we skip or subtract one day. The period of 9 * 52 * 365 + 117 - 3 days or 468 years is a time for change in human society. The accuracy is 99, 99999940587366% between the "tropical year"...
Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.
Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance. Fluorite, the primary mineral source of fluorine which gave the element its name, was first described in 1529; as it was added to metal ores to lower their melting points for smelting, the Latin verb fluo meaning "flow" gave the mineral its name. Proposed as an element in 1810, fluorine proved difficult and dangerous to separate from its compounds, and several early experimenters died or sustained injuries from their attempts. Only in 1886 did French chemist Henri Moissan isolate elemental fluorine using low-temperature electrolysis, a process still employed for modern production. Industrial production of fluorine gas for uranium enrichment, its largest application, began during the Manhattan Project in World War II.
81 (eighty-one) is the natural number following 80 and preceding 82.
the square of 9 and the fourth power of 3.
a perfect totient number like all powers of three.[1]
a heptagonal number.[2]
a centered octagonal number.[3]
a tribonacci number.[4]
an open meandric number.
the ninth member of the Mian-Chowla sequence.[5]
a palindromic number in bases 8 (1218) and 26 (3326).
a Harshad number in bases 2, 3, 4, 7, 9, 10 and 13.
one of three non-trivial numbers (the other two are 1458 and 1729) which, when its digits (in decimal) are added together, produces a sum which, when multiplied by its reversed self, yields the original number:
8 + 1 = 9
9 × 9 = 81 (although this case is somewhat degenerate, as the sum has only a single digit).
Look up eighty-one in Wiktionary, the free dictionary.
The inverse of 81 is 0.012345679 recurring, missing only the digit "8" from the complete set of digits.
Ottantuno (cf. latino octoginta unus, greco εἷς καὶ ὀγδοήκοντα) è il numero naturale dopo l'80 e prima dell'82.
È un numero dispari.
È un numero composto, con quattro divisori: 1, 3, 9 e 27. Poiché la somma dei divisori (40) è minore di ottantuno, il numero viene detto difettivo.
È il quadrato di 9 (e quindi è un quadrato perfetto) e la quarta potenza di 3.
È un numero perfetto totiente.
È un numero ettagonale.
È un numero potente.
È un numero di Harshad.
È un termine della successione di Mian-Chowla.
È parte delle terne pitagoriche (81, 108, 135), (81, 360, 369), (81, 1092, 1095), (81, 3280, 3281).
È un numero palindromo nel sistema di numerazione posizionale a base 8 (121).
The Maya calendar is a system of calendars used in pre-Columbian Mesoamerica, and in many modern communities in highland Guatemala and in Veracruz, Oaxaca and Chiapas, Mexico.
The essentials of the Maya calendar are based upon a system which had been in common use throughout the region, dating back to at least the 5th century BCE. It shares many aspects with calendars employed by other earlier Mesoamerican civilizations, such as the Zapotec and Olmec, and contemporary or later ones such as the Mixtec and Aztec calendars. Although the Mesoamerican calendar did not originate with the Maya, their subsequent extensions and refinements of it were the most sophisticated. Along with those of the Aztecs, the Maya calendars are the best-documented and most completely understood.
Frederico Custodio Ribeiro