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  2. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440).

  3. Chord chart - Wikipedia

    en.wikipedia.org/wiki/Chord_chart

    A chord chart. Play ⓘ. A chord chart (or chart) is a form of musical notation that describes the basic harmonic and rhythmic information for a song or tune. It is the most common form of notation used by professional session musicians playing jazz or popular music.

  4. Cereal growth staging scales - Wikipedia

    en.wikipedia.org/wiki/Cereal_growth_staging_scales

    61: Beginning of flowering: first anthers visible 65: Full flowering: 50% of anthers mature 69: End of flowering: all spikelets have completed flowering but some dehydrated anthers may remain 7: Development of fruit 71: Watery ripe: first grains have reached half their final size 73: Early milk 75: Medium milk: grain content milky, grains ...

  5. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Depending on the colors used, consider one of six pairs: (29,44) (25,58) (22,60) (21,45) (15,49) (8,50) Microscopy [8]: 53–59 A 25 Used singly or paired with D to approximate monochromatic light with 670 nm. B2 58 Used singly or paired with H, G, or E to approximate monochromatic light with 510, 540, or 575 nm, respectively. C5 47

  6. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  7. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .

  8. List of point distributions of the FedEx Cup - Wikipedia

    en.wikipedia.org/wiki/List_of_point...

    In events in which there are cuts, only golfers who make the cut for an event will receive points for that event. In case of a tie, point totals are added together and divided among all golfers tied for a particular position at the end of a tournament.

  9. 61st parallel south - Wikipedia

    en.wikipedia.org/wiki/61st_parallel_south

    The 61st parallel south is a circle of latitude that is 61 degrees south of the Earth's equatorial plane. No land lies on the parallel—it crosses nothing but the Southern Ocean . At this latitude the sun is visible for 19 hours, 16 minutes during the December solstice and 5 hours, 32 minutes during the June solstice . [ 1 ]