Ok,
seriously, this isn’t my call (mathematico-logics, I mean). My call is medicine. But then, my curiosity has been
fueled by the peculiar date of birth of my friend. He was born on the 29th
of February, 1988, and so i'd try.
Permit
me to state the Naegele’s rule which is the standard way of calculating the due
date for a pregnancy. The rule estimates the expected date of delivery(EDD) from
the first day of the last menstrual period by adding one year, subtracting
three months (or adding nine months), and adding seven days to the first day of
a woman’s last menstrual period(LMP).
Example:
I
am presenting a 26 year old Turkish woman, who is a banker whose last menstrual
period (LMP) begun on the 16th March, 2013(16/03/2013). What is her
expected delivery date (EDD)?
LMP=16/03/2013
+1
year= 16/03/2014
-3 months/+9 months= 16/12/2014
+7 days= 23/12/2014
Therefore,
the EDD is 23rd of December, 2014
I
would like to reverse the process a bit so as to arrive at the LMP, since the
EDD is given (assuming EDD was 40 weeks/280 days from LMP)
EDD=
29/02/1988
LMP=?
-1
year= 29/02/1987
+3
months= 29/05/1987
-7
days= 22/05/1987
LMP=
22/05/1987
Anyways,
now that the LMP has been ascertained (provided the date of delivery wasn’t
beyond/before the EDD), we ought to discuss the leap year, oughtn’t we? Why is
there a leap year?
A
leap year is a year in which a leap day is added to the calendar, so as to
synchronize it with the seasons.
Why
do we need leap years? Leap years are needed to keep our calendar in alignment
with the Earth’s revolutions around the sun. This is because the earth takes
about 365 days, 5 hours, 48 minutes, and 46 seconds to circle once around the
sun. if the 29th day wasn’t added to February on the Gregorian calendar
(the standard calendar for civil use), after a century, our calendar would be
off by about 24 days. Does that look small? Ok, how about this: we would have
lost about 6 hours off our calendar every year!
The
implications are that without a leap year, we would all have unstable birthdays
and there would be asynchrony of the calendar.
A
leap year is evenly divisible by 4, 100, and 400. It was introduced by Julius
Caesar in 46 B.C. but has since been modified.
Really,
without the leap year, life on earth wouldn’t be as organized as it is now.
To
the friend who made this blog post possible #Oladele Femi#…and who indeed made blogging
a reality for me.
HAPPY
BIRTHDAY!!!!
Your
EDD, if right, states that you weren’t conceived in a leap year, but and that
without your date, the earth would be asynchronized. You are indeed special.
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