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Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).It is typically determined from ultrasound imagery and can be used to estimate gestational age.The ancient Roman calendar was believed to be an observational lunar calendar, based on the cycles of the moon's phases.The Romans were then believed to have adopted a 10-month calendar with 304 days, leaving the remaining 50 or so days as an unorganized winter.The months of April, June, September, and November have 30 days, while the rest have 31 days except for February, which has 28 days in a standard year, and 29 in a leap year.The Gregorian calendar is a reformed version of the Julian calendar, which was itself a modification of the ancient Roman calendar.The Gregorian calendar is the most prevalently used calendar today.

Gestational age is not the same as fertilization age.

Pope Gregory XIII addressed this by essentially skipping 10 days in the date, making the day after October 4, 1582, October 15.

An adjustment was also made to the algorithm of the Julian calendar that changed which century years would be considered leap years.

Despite all efforts, the Julian calendar still required further reform, since the calendar drifted with respect to the equinoxes and solstices by approximately 11 minutes per year.

By 1582, this resulted in a difference of 10 days from what was expected.

Others such as the birthday of Martin Luther King, Jr., don't have a fixed date, because they occur on a "floating Monday"; in this particular case, the holiday occurs on the third Monday of January. S., Thanksgiving, occurs on a "floating Thursday," the fourth Thursday In November, hence the dates of these holidays vary by year.