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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics . Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...

  3. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The mechanical calculator industry started in 1851 Thomas de Colmar released his simplified Arithmomètre, which was the first machine that could be used daily in an office environment. For 40 years, [ 58] the arithmometer was the only mechanical calculator available for sale and was sold all over the world.

  4. Analemma - Wikipedia

    en.wikipedia.org/wiki/Analemma

    In astronomy, an analemma ( / ˌænəˈlɛmə /; from Ancient Greek ἀνάλημμα (analēmma) 'support') [ a] is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same mean solar time, as that position varies over the course of a year. The diagram will resemble a figure eight.

  5. Pascal's calculator - Wikipedia

    en.wikipedia.org/wiki/Pascal's_calculator

    Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen. [ 2] He designed the machine to add and subtract two numbers ...

  6. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    The estimated date of delivery ( EDD ), also known as expected date of confinement, [ 1] and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. [ 2] Normal pregnancies last between 38 and 42 weeks. [ 3] Children are delivered on their expected due date about 4% of the time.

  7. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  8. Solar zenith angle - Wikipedia

    en.wikipedia.org/wiki/Solar_zenith_angle

    The solar zenith angle is the zenith angle of the sun, i.e., the angle between the sun’s rays and the vertical direction. It is the complement to the solar altitude or solar elevation, which is the altitude angle or elevation angle between the sun’s rays and a horizontal plane. [1] [2] At solar noon, the zenith angle is at a minimum and is ...

  9. Watch the Drama-Filled '90 Day Fiance: Before the 90 Days ...

    www.aol.com/entertainment/watch-drama-filled-90...

    The 32-year-old musician starred in season 4 of Before the 90 Days, which aired in 2020. After splitting from ex-wife Lisa Hamme, the Nigeria native is now pursuing a relationship with Kim, 50 ...