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In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
October 7. "You Always Hurt the One You Love". The Mills Brothers. [ 41] October 14. "I'll Walk Alone". Dinah Shore. "(There'll Be a) Hot Time in the Town of Berlin (When the Yanks Go Marching In)" Bing Crosby and the Andrews Sisters with Vic Schoen and His Orchestra.
For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.
The Hebrew numeric system operates on the additive principle in which the numeric values of the letters are added together to form the total. For example, 177 is represented as קעז which (from right to left) corresponds to 100 + 70 + 7 = 177. Mathematically, this type of system requires 27 letters (1-9, 10–90, 100–900).
Top 100 - an early version of the Hot 100, the first chart to feature a combined tabulation of sales, airplay and jukebox play. Note: In the issues dated February 25, June 16, September 15, November 17, and December 22, Billboard reported a tie for the number-one single on the Top 100.
This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.
John Denver was the only act to have more than one song reach number one, with two. 1974 is tied with 1975 for scoring the most Hot 100 number ones, 35 each. The year would have more number ones than 1975, at 36, if including " Time in a Bottle " by Jim Croce , which initially topped the Hot 100 on December 29, 1973, and stayed atop the chart ...
Chart history. "9 to 5" by Dolly Parton reached the top spot for two non-consecutive weeks on February 21 and March 14, 1981, sandwiched with two weeks of "I Love a Rainy Night" by Eddie Rabbitt. Sheena Easton 's No. 1 hit "9 to 5" was retitled "Morning Train" to avoid confusion. The yellow background indicates the No. 1 song on Billboard 's ...