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  2. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The equation of time is obtained from a published table, or a graph. For dates in the past such tables are produced from historical measurements, or by calculation; for future dates, of course, tables can only be calculated. In devices such as computer-controlled heliostats the computer is often programmed to calculate the equation of time.

  3. Degree day - Wikipedia

    en.wikipedia.org/wiki/Degree_day

    (The degree, in Celsius and measured relative to a base temperature, is identical to the kelvin, the SI base unit). Expressed as a proper SI unit, a quantity of kelvin second is four orders of magnitude higher than the corresponding degree day (1 Celsius degree-day is 8.64×10 4 K·s; 1 Fahrenheit degree-day is 4.8×10 4 K·s).

  4. Principles and Practice of Engineering exam - Wikipedia

    en.wikipedia.org/wiki/Principles_and_Practice_of...

    PE Civil Transportation: 1421: 68%: 815: 33% PE Civil Water Resources and Environmental: 1430: 71%: 613: 35% PE Control Systems: 229: 79%: 49: 45% PE Electrical and Computer: Computer Engineering 21 62% 7 29% PE Electrical and Computer: Electrical and Electronics 104 78% 43 60% PE Electrical and Computer: Power 1003 66% 509 38% PE Environmental ...

  5. Comparison of Texas Instruments graphing calculators

    en.wikipedia.org/wiki/Comparison_of_Texas...

    Calculator CPU RAM Display Size Physical Size (inches) Contains CAS Year Released Initial MSRP (nominal US$) [1] Use on College Board Standardized Tests [2] Use on ACT Standardized Tests [3] TI-73, TI-73 Explorer: Zilog Z80 @ 6 MHz: 25 KB of RAM, 512 KB of Flash ROM: 96×64 pixels 16×8 characters 7.3 × 3.5 × 1.0 [4] No 1998/2003 95 (TI-73 ...

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.

  7. Sidereal and tropical astrology - Wikipedia

    en.wikipedia.org/wiki/Sidereal_and_tropical...

    The dates the Sun passes through the 12 astronomical constellations of the ecliptic are listed below, accurate to the year 2011. The dates will progress by an increment of one day every 70.5 years. The corresponding tropical and sidereal dates are given as well.

  8. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    In cases where the difference between sin and tan is significant, the tangent is used. In either case, the following identity holds for all inclinations up to 90 degrees: ⁡ = ⁡ ⁡. Or more simply, one can calculate the horizontal run by using the Pythagorean theorem, after which it is trivial to calculate the (standard math) slope or the ...

  9. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the