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  2. Date of the birth of Jesus - Wikipedia

    en.wikipedia.org/wiki/Date_of_the_birth_of_Jesus

    The earliest source stating 25 December as the date of birth of Jesus is likely a book by Hippolytus of Rome, written in the early 3rd century. [128] He based his view on the assumption that the conception of Jesus took place at the Spring equinox which Hippolytus placed on 25 March, and then added nine months to calculate the date of birth ...

  3. East Asian age reckoning - Wikipedia

    en.wikipedia.org/wiki/East_Asian_age_reckoning

    How the age of a Korean person, who was born on June 15, is determined by traditional and official reckoning. Traditional East Asian age reckoning covers a group of related methods for reckoning human ages practiced in the East Asian cultural sphere, where age is the number of calendar years in which a person has been alive; it starts at 1 at birth and increases at each New Year.

  4. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...

  5. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of 280 days at childbirth. The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.

  6. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation. Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization. Trophoblast cells surrounding the embryonic cells proliferate and invade deeper into the uterine lining. They will eventually form the placenta and embryonic membranes.

  7. Immaculate Conception - Wikipedia

    en.wikipedia.org/wiki/Immaculate_Conception

    The Immaculate Conception is the belief that the Virgin Mary was free of original sin from the moment of her conception. [1] It is one of the four Marian dogmas of the Catholic Church. [ 2 ] Debated by medieval theologians, it was not defined as a dogma until 1854, [ 3 ] by Pope Pius IX in the papal bull Ineffabilis Deus . [ 4 ]

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