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The 8870 Dating System
Fra : Hans Engmark


Dato : 22-03-03 22:48


En anden måde at regne datoer ud på

mvh
Hans Engmark


The 8870 Dating System

http://www.usgenweb.org/researchers/calendar.html

http://www.angelfire.com/ar2/FlutyFam/8870datingsystem.html


8870 Formula for Determining Birthdates:

Use this formula when the tombstone lists no date of birth, but does
list the date that a person died - say May 6, 1889 and was 71 yr, 7mo,
9 days old. In order to arrive at the birthdate, one has only to use
the 8870 formula to quickly get the date of birth rather than taking
time to count backward.

The 8870 formula using the above date and age as an example:

Date of death - 1889 May 6 = 18890506 (where 1889=year, 05=month,
06=day)
Age at death - 71 yrs 7 mo 9 days = 710709 (where 71=years, 07=months,
09=days)
Subtract 710709 from18890506 =18179797
Subtract the Constant (8870) from 18179797
Result = 18170927 (where 1817 = year, 09 = month, 27 = day. This
person was born 27 Sep 1817)
If the age in months and age in days are less than the month and day
in the date of death, you can just subtract directly, i.e.,

Date of death - 1868 Dec 25
Age at death - 45 yrs. 5 mo 4 days
Subtract 45 from 1868 = 1823
Subtract 5 from 12 = 7
Subtract 4 from 25 = 21
Result = 1823 Jul 21 or the date of birth




 
 
Hans Engmark (23-03-2003)
Kommentar
Fra : Hans Engmark


Dato : 23-03-03 01:22

On Sat, 22 Mar 2003 22:47:46 +0100, Hans Engmark
<hengmark@post6.tele.dk> wrote:

En tilføjelse

Mvh
Hans Engmark


The 8870 Dating System = The 30-day-month method


However, if the death year is a leap year, you should use 8871, rather
than 8870. And if the month previous to the death had 31 days, you
should use 8869, rather than 8870."


--------------------------------------------------------------------------------

DETERMINING AGE:
In determining the age of a person who was born 14 Sep 1752 and who
lived after that date, one must take into account of the 11 days that
we lost in Sep 1752, otherwise the person will appear to be 11 days
older than he actually was at any given time after the calendar
change. In order to determine the Old Style (O.S.) birth date when age
of death is given for a person who was born before the calendar change
and died after 1752, 11 days must be subtracted.




Eller prøv denne

This calculator can use either the exact month method or the 30 day
month method to compute a birthdate. While you may think to put more
credence in the result by the exact calendar month method, be aware
that many headstone and obituary ages at death appear to have been
computed using the 30-day-month method. ( assumes that all months have
30 days. It's an approximation which agrees with the exact calendar
month method about 2/3 of the time.)

http://www.searchforancestors.com/utility/birthday.html




Otto Chr. Thygesen (23-03-2003)
Kommentar
Fra : Otto Chr. Thygesen


Dato : 23-03-03 09:23

On Sat, 22 Mar 2003 22:47:46 +0100, Hans Engmark
<hengmark@post6.tele.dk> wrote:

>
>En anden måde at regne datoer ud på
>
>mvh
>Hans Engmark
>
>
>The 8870 Dating System
>
Og selvfølgelig svigter metoden, såfremt det beregnede tidsrum
indeholder datoen for kalenderreformen, i Danmark slutningen af
februar 1700. Så må man tage højde for de forsvundne 11 dage, 1. marts
fulgte umiddelbart efter 18. februar.

M.v.h.
O.C.

Hans Engmark (23-03-2003)
Kommentar
Fra : Hans Engmark


Dato : 23-03-03 14:14

On Sun, 23 Mar 2003 09:22:32 +0100, Otto Chr. Thygesen
<thygesen@email.dk> wrote:

>On Sat, 22 Mar 2003 22:47:46 +0100, Hans Engmark
><hengmark@post6.tele.dk> wrote:

>Og selvfølgelig svigter metoden, såfremt det beregnede tidsrum
>indeholder datoen for kalenderreformen, i Danmark slutningen af
>februar 1700. Så må man tage højde for de forsvundne 11 dage, 1. marts
>fulgte umiddelbart efter 18. februar.

Hvis de to datoer ligger før og efter februar 1700, så skal man
selvfølgelig tage højde for det.

Men du kan jo aldrig vide om præsten, der skrev i kirkebogen har taget
højde for det, så resultatet vil altid kun være et gæt, eller

Det der kan siges for nuværende under de givne forudsætinger på det
foreliggende grundlag.

mvh
Hans Engmark

Bjarne Damsgaard (23-03-2003)
Kommentar
Fra : Bjarne Damsgaard


Dato : 23-03-03 10:46

On Sat, 22 Mar 2003 22:47:46 +0100, Hans Engmark
<hengmark@post6.tele.dk> wrote:

>
>En anden måde at regne datoer ud på
>
>mvh
>Hans Engmark

Prøv metoden på:

http://www32.brinkster.com/sognetraef/8870Date.asp

Der tages ikke højde for skudår, 31-dages reglen (der må vel også være
en 28-dages regel?) eller kalenderreformen i 1770 - men det kommer.

mvh
Bjarne Damsgaard


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