How accurate is the pregnancy calendar for calculating your day of conception?

Not always but they claims it's about 90%

A conception calendar is used to estimate when a baby was conceived. It usually uses the date of a woman's last menstrual period to estimate conception and due date.

Fertilization usually occurs in 2-3 days. Try out the dog pregnancy calendar (see links below) to follow the development of puppies throughout your dog's pregnancy.

The Egyptians developed the first accurate calendar.

It is believed to have been created by Romulus, the founder of Rome. Several different forms of it evolved during the 700 years it was in use before it was finally reformed by Julius Caesar into the Julian calendar, which is extremely similar to, but less accurate than, the Gregorian calendar we use today. The original Roman calendar's founder is unknown as it was a date calculating system that was traditional. The calendar that we…

They will start to become pink betweent the 14-21st day after conception. Try this pregnancy calendar for cats: http://www.purrinlot.com/preg.htm

very accurate :P

The development of the accurate calender was in 450 B.C.

Probably not. Most symptoms don't occur until you're 3-4 weeks along. You wouldn't start noticing 'the bump' until well after that. So, unless you've missed a period, it's not very possible to tell only two weeks after possible conception. Well at two weeks pregnant, you are probably not even pregnant. Doctors consider the first week of pregnancy your menstrual period, and it is usually about the third week of pregnancy that you even conceive!!! Weird…

Our calendar is incompletely inaccurate.

The Iranian (Persian) Calendar, is the most accurate and one of the oldest (as far back as 2000 BC Zoroastrianism) calendars.

Web MD. Com has a great pregnancy calendar that you can type all your infor in and will give you the dates you need.

they were just as accurate as the one we use now with 365 days

The Aztec calendar recognised 365 days

It's possible, but it is too early to tell. Most pregnancy tests only give an accurate reading roughly 10 days after conception, so if it hasn't been that long - wait! If you want a definitive answer, go to your doctor or health clinic and request a blood test to confirm pregnancy. Being 2 days late for your period isn't something to worry about, as your body goes through a cycle related to your system…

The difference is the accuracy of mathematical computation of the length of the day, in essence. The Roman calendar was fairly accurate (considering the computation tools of the time, quite accurate), but over a period of many years, it was off by a period of (then) ten days. The Gregorian calendar proposal used more precise mathematics, and deduced that the calendar had lost ten days since the calendar of Rome was established. The calendar was…

the first accurate calebdar was recorded to be made in 450 B.C.E.

Get the calendar out on that one and count 40 weeks back

Of a human baby..

Important to who? The Aztecs probably would have thought your calendar was pretty unimportant. The Aztecs themselves considered their calendar extremely important, because it documented the cycles of the world and the powers of the gods. Non-Aztecs consider the Aztec calendar important because it was very sophisticated and accurate for a non-modern society. Accurate in the sense that it kept good time, not in the sense that it made accurate "predictions".

The moon phases are fairly accurate as it states in the calendars. Though, the calendar does not make room for weather conditions, as in a cloudy night, the calendar is accurate most of the time, with an absolute deviation of about half a week (3-4 days).

Pregnancy is measured as 40 weeks from the first day of your last period, although most people say 'nine months' which is less accurate. It can equate to almost ten calendar months.

The Google Calendar is very accurate, and doesn't contain any immediately visible errors. One can assume that the Google calendar is able to keep track of any important holidays all over the world, as well as American national holidays and religious holidays.

According to both the Answers article on Jilian calendar and the article regarding the Gregorian calendar; the Jilian calendar did not do a very good job of calculating leap years. It takes the Earth a little more than a year to compete one orbit around the sun. The Jilian calendar's method of allowing for the extra time needed was so out of sync that it was off by several days when it was finally replaced…

Moon calendar can be found on many watches but are frequently there as a gimmick or design feature. Accurate moon calendars can be found on websites like Time And Date and Moon Connection.

it fake lo XD

Because they defeat them

Yes, October 1582 was the introduction of the Gregorian calendar, which is almost identical to its predecessor but 25 times more accurate.

One can information about the Chinese pregnancy calendar through a variety of sources such as ones public library and internet sources such as websites run by companies like Parents and EveryDayFamily.

The Gregorian calendar is the standard calendar of the "western" world. It was introduced in 1582 as a reform of the Julian calendar, which is almost identical but has 7.5 more leap year days per millennium than the Gregorian calendar, making it about 25 times less accurate.

It is a reform of the Julian calendar, which loses a day every 128 years. The Gregorian calendar loses a day every 3200 years, making it 25 times more accurate.

The world wide web provides people with a number of different websites to enable you to work out the due date of a pregnancy. The NHS have a whole section devoted to pregnancy. Clearblue, who produce a variety of products that aid couples to conceive, have an online ovulation and pregnancy due date calendar.

he described Pascals triangle 500 years prior to Pascal. He also developed the Iranian calendar, a.k.a. the Jalali calendar which was more accurate than the Gregorian calendar.

The Aztecs relied on a 365-day agricultural calendar, this calendar showed which times of year it was best to plant and harvest. This agricultural calendar accurately showed the tie it took for the Earth to travel around the sun.

It is accurate to 1/2 second per lunar month (about 1 and 1/2 hours per 1000 years).

Record special events :)

the mayans created the first calendar

The invention that the Babylonians were known for was the accurate calendar, astronomy, and mathematics.

~42 weeks prior ... look at a calendar and you will be able to figure the approximate date out.

The Mayan Calendar, Neurosurgery, and the most accurate Architecture ever built.

to keep track of religious observances

The Mayan civilization.

The Julian calendar was used in most places that use the Gregorian calendar today, especially in countries considered "Christian". The switch to the Gregorian calendar, which is very similar but 25 times more accurate, began on October 15, 1582 (Gregorian date).

the question is wrong. It has to be: How accurate in seconds is an atomic clock in 63million years? That is 1 round of Mayan calendar

9 calendar months, 10 4-week months. 9 calendar months, 10 4-week months.

Julius Caesar introduced leap years when he reformed the Roman calendar in 46 BCE. His calendar, which is called the Julian calendar, was in use for almost 20 centuries. Beginning in 1582, it was eventually replaced by the Gregorian calendar, which is almost identical to the Julian calendar but is more accurate because it has fewer leap years.

The question asked contains the answer ... you conceived 7 weeks and 2 days ago . Since there are 7 days in a week, multiply 7 times 7 and then add 2. 7X7 = 49 +2 = 51. Grab a calendar and count back 51 days and you will have an approximate date of conception. It's not all that accurate but it is really close.

The Islamic calendar is lunar, which means it's based on the phases of the moon. It is either 354 or 355 days long, and began in the year 622 CE when the Prophet Muhammad migrated from Mecca to Medina. The Gregorian calendar is solar. It is about 365 days long, and numbers 0 CE at the birth of Jesus. It is a reform of the Julian calendar as used up to Pope Gregory's time, together…

Some of the gifts from the Romans that we all use today are concrete, central heating and indoor plumbing. An accurate calendar, a newspaper and several principles in law, such as the right to a trial are three more.

There are 365 days in a year. 365 X 24 = equals 8,760. However, this is not quite accurate when you consider leap years which would have 366 days. At least by the Gregorian calendar. There are 365 days in a year. 365 X 24 = equals 8,760. However, this is not quite accurate when you consider leap years which would have 366 days. At least by the Gregorian calendar. There are 365 days in…