Number 120

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[Calendar]  The Chinese calendar is calculated based on the meridian 120o East since the year 1929, which is nearer to the Nanjing meridian 118o46’ than the Beijing meridian 116o25’.

[EECS]  120(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%).  120pF (picofarads) is one of standard numerical values for capacitors.

[Math.]  A triangular number (sum of all integers from 1 to 15): 120 =

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15.

[Math.]  5 factorial = 5! = 1×2×3×4×5 = 120.

[Math.]  Each internal angle of a regular 6-sided polygon (hexagon) is 120o.

[Math.]  sin(210o) = sin(330o) = cos(120o) = cos(240o) = –0.5

sin(60o) = sin(120o) = cos(30o) = cos(330o) = 31/2/2.

[Math.]  An untouchable number. The sequence of the firstuntouchable numbers is: 2, 5, 52, 88, 96, 120…

[Math.]  The set of 4 numbers (1, 3, 8, 120) has a property that the product of any 2 numbers is always equal a square number minus 1.

[Math.]  2520 = 120×021 = 210×012.

[Math.]  Four square numbers using the same digits: 1022 = 10404, 1202 = 14400, 2012 = 40401 and 2102 = 44100.

[Math.]  The perfect score for the William Lowell Putnam Competition in Mathematics (organized by Harvard University Mathematics Department) for U.S. and Canadian university students: 12 problems of 10 points each, which are divided in two 3-hours sections of 6 problems each.

[Math.]  The 3rd square number that is the sum of squares of 2 consecutive numbers: 28561 = 1692 = 1192+1202. Each root number in the series is 6 times the previous root number minus the earlier root number:  1, 52, 292, 1692, 9852Or in other words:

(119, 120, 169) is the 3rd Pythagorean triple (lengths of 3 sides of a right triangle), where 2 sides are consecutive integers.

[Measure]  A cable’s length = 120 fathoms = 720 feet.

[Science]  The number 1063 is vigintillion, in American system. In British system, vigintillion is 10120.

[Sport]  The length (yards) of an American football field, including two 10-yard end zones.

[Tech.]  The number of different colors in the current largest box of Crayola Crayons. There were only 8 colors in 1903 when first introduced by Edward Binney and Harold Smith.

[Tech.]  The standard voltage of the A.C. electrical power in the U.S. is 120 volts or 240 volts. (A.C. = alternating current).

[Tech.]  Automobile Tire’s Speed Rating

 Tire Rating L M N P Q R S Max. Speed (mph) Max. Speed (kph) 75 120 81 130 87 140 93 150 100 160 106 170 112 180 Tire Rating T U H V W Y Max. Speed (mph) Max. Speed (kph) 118 190 124 200 130 210 149 240 168 270 186 300

[Theology]  The maximum number of cardinals who are under the 80-year-old age limit (by the date of a Pope’s death) to be eligible at papal conclave for voting the next Pope. (Rules changed by Pope Paul VI in 1975).

[World]  The ISO country code for Cameroon. (ISO-3166).

120-129

[Library]  Numbers 100-199 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Philosophy, Psychology and Ethics… Numbers 120-129 are for books in Epistemology and Humankind.

120 (separate page)

121 (separate page)

123 (separate page)