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2. How The Molad Impacts Todays Calendar
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Rosh Hashanah Illuminated All Daf Exclusive Rabbi Dovid Heber, a native of St. Louis learned in Telshe Yeshiva Chicago and Yeshivas Ner Yisroel where he received semicha. Rabbi Heber was a Rabbinical Coordinator in the Kashrus Division of the OU in the early ’90s. He is the Rav of KAYTT in Baltimore and a Kashrus Administrator at Star-K. He recently authored The Intriguing World of Jewish Time: Fascinating Zmanim and Calendar Calculations published by Israel Bookshop Publications.
Categories:Torah/Yamim Tovim
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Auto-generated transcript. Not time-synced to the video.
[Applause]
[Music]
in the last session we discussed
that the moon goes around the earth and
it takes 29 days 12 hours 44 minutes in
acrylic and every time
every month we have the shasta milan
which is the moment of the new moon
this is the basis of the calendar
i want to talk a little bit about the
implications
of
the time of the milan
when the might occurs as is discussed in
the gemara rosh hashanah
that's going to be the that's going to
be the determinant
of the day of rosh hashanah
the first step in determining the
calendar
is to
know the shasta milad
for the month of tishrei
so for example this past rosh hashanah
was on tuesday why was it on tuesday
the answer is
is the my lot of tishrei tough shin pay
bays
occurred
on monday night
at 11 27 pm and 11 khalakim
this time of the mail odd
this was a time again as we explained
based on the average
this time goes all the way back
to pre-assailant when the world was
created
on the marisha and ayamaras islam
on rosh hashanah it was a friday
that other mauritian was created on that
day the maillad occurred
at 8 a.m
on friday morning
and from that moment on
we add
29 days 12 hours 44 minutes and a half
to every month
again there's leap years which we'll
talk about a little bit later
and we come to tough shape bays all the
years later
we come to
tough champay bays and we get to my lot
so this time of the mile for tishrei
is based on a heisman that we calculated
all the way back
to pre-assailant
so if the my line was at 11 27 pm and 1
on monday night
so that's
lishi
and therefore
rosh hashanah was on yamcha she was on
tuesday because the mail that occurred
on tuesday and therefore when hillary
cheney established the calendar in 4119
which is 359 in the common era
and he determined that rosh hashanah of
tough should pay bays should be on
tuesday
and therefore is on tuesday wednesday
and yum kippur was on thursday and
circus was on tuesday wednesday and
was on
wednesday thursday etc
all of that was based on this time of
the milan that occurred on monday night
monday night is tuesday and therefore
shoshannah had to be on tuesday
now what's interesting is is that the
iker myla the primary mylad of the year
and really the only mylar that we work
with to determine
the months and to determine exactly
how the year and months are laid out
is the myelin of tissue
because why is it
that we look at this coming year we all
got a calendar of this year and we know
that next pesach will be on shabbos
and schwooz is going to be on sunday in
tough shape base and next rosh hashanah
is going to be on
a monday
the reason is is because
the the my lad
for tough shin
pay gimmel hubba leno taiva
is going to be on sunday night
at 9 00 p.m
and six khalikam
sunday night
is yamchaini
so next rosh hashanah
has to occur on shaini
and the way the year is determined this
year happens to be a leap year we'll
we'll discuss exactly why it's a leap
year
and we'll see we'll see the gemara in
roshana's discussion of that as well but
let's just take on at this point that
it's a leap year so we need 13 months so
we took the mileage of tishrei of tough
ship paybays
and we add the money for
the next month 29 days 12 hours 44
minutes and a helic for
and then we do it again for kiss slave
and again and we'll announce every
single month
and then we come to again 13 months
later and we determine based on the
milan
that's on sunday night that rosh
hashanah has to be on
monday
so what we know based on the shasta
milan is that rosh hashanah tough should
pay bays
had to have been on a tuesday which it
was based on the shots of milan
and then rosh hashanah of tough shape
gimmel has to be on a monday based on
the shasam island
all the other months will then fall into
place and that
is how the year
is determined in other words technically
the reason why reshred
this year was on wednesday and thursday
it was not because the my life was on
wednesday night
the reason why the mother
was on wednesday and thursday was
because
rosh hashanah was on tuesday and
wednesday meaning what i mean to say is
that
all we primarily all we care about in
determining the year
is the milot of tishrei
this tishrei and the milot of the
following tishrei and then we say okay
how do i make this work how do i make
rosh hashanah on a tuesday
this year and rosh hashanah on monday
next year in a leap year in order to do
that we need 384 days
basically we need 55 weeks minus a day
it's going to be almost 55 weeks 54
weeks and six days that's how long tough
should pay pays has to be
so
very simple to do that we need 384 days
how do we do that
there are two months during the year
and kislev
which
could be 29 or 30 days in other words
every other month is already set tishrei
is always 30 days
te-base
is always 29 days schwart
is always 30 days
although re-shining in a leap year which
we have this year is always 30 days
either shaney or other in a regular year
other hassam nissan is always 29 days
nissan is 30 er is 29. steven is 30.
thomas is 29 of his 30 el is
29 always so it doesn't matter when the
milot fell out
it makes no difference we're looking at
this roshana and next rosh hashanah how
many days do i need we need 384 days
this year to facilitate that
we're going to make hezman 29 days hazal
ghazal said let's make hezhan 29 days
and kiss slave 30 days by doing that
that's called considron because we go
crusader titus rate's 30. cancer is 29.
kislev is 30 davis is 29 it goes casidra
it goes cassayder
there are some years for example
let's take a shot
where we have the first rosh hashanah
has to be on a monday and the next rosh
hashanah based on the calculations of
the milad have to be on thursday so how
do we facilitate rosh hashanah of one
year on a monday and rashad of next year
on thursday we're talking about a
non-leap year we need 353 days that's 50
weeks
and three days in order to facilitate
that
we're going to make heisman and kitslave
both
29 days that year is known
as a
huster because it's missing
we have tishrei 30 casual 29
kiss slave 29
teve is 29 3 months in a row of 29 days
and only shabbat we get to 30 and then
you'll have of course one day versus
three months in a row
when when that happens
so
then then it will work we'll make sure
that rosh hashanah falls out
on the correct day
in the following year
and that's how the years work a year
could be
353 days 354 days
355 days shanab
or in an ibrahiar
it could be
384 or 385
days
let's say rosh hashanah of this year
needs to be on a monday
and rosh hashanah of next year needs to
be on a thursday to facilitate that we
need to have 353 days in the year
and therefore will make reject
only khasir will make them both 29 days
only 29 days
and that will mean that the next rosh
hashanah will have rosh hashanah on a
monday the following pace that will be
on a tuesday and then rosh hashanah will
be on a thursday the year will have 353
days because
slave were only 29 days and that means
rich she'll have three months in a row
where we'll only have one day everest
if you need a constituent as we
explained it's 29 30. if you need a
chalet let's say this rosh hashanah is a
monday
and next rosh hashanah
has to fall out on a shabbos
to facilitate that in the sharpshooter
in a regular year will need
to have
days will need to have heiser and kislev
both 30 days that's known as a sholem
and therefore we'll have cashmere
kislyak 30 days that will make sure that
rosh hashanah if you just go through the
months and you see every month switches
off twenty nine thirty again you'll have
kind of a kiss like thirty and then
shiva will be twenty nine and um to
shout out excuse me tavis will be twenty
nine shadow be thirty and so on you'll
end up with roshana on the correct day
now
in an ibra yard in a leap year you have
an extra 30 days the extra month on the
re-shine is always going to be 30 days
so you get extra 30 days that's four
weeks and two days
it'll either be 383 384 or 385 again as
we mentioned this year is 384 days that
is the most that is the rarest number of
days in the year it's the least frequent
number of days
that we can have in a year last time we
had such a year was um 1994 1995 that
would have been
tough shin
nun
hey was the last time we had 384 days
385 days is an interesting year because
it's a leap year
and
the days the following year will repeat
themselves in other words you'll have
let's say rosh hashanah is on a shabbos
and you want to have 385 days that means
you have 55 complete weeks so next rosh
hashanah is going to be on a shabbos
again so you'll have an ibuyer you'll
have an extra other and
kiss like both 30 days
that's a packed jam packed with days 385
days 55 weeks rosh hashanah this year
will be on a shambhas rashad and next
year will be on a shabbos arushan this
year will be on a thursday
and roshana next year
will once again be on a thursday or you
could have monday to monday
right you'll never have tuesday rosh
hashanah repeated
you'll never have a shame with the with
rashaan on a tuesday but you could have
the other days of the week of shalom in
the leap year and therefore rosh
hashanah and sukkas and so on uh
um typhoon pesach and so on will will
repeat themselves okay so that's the
basis of the year so we've seen that the
iker mylad
of the year is the myelin of tishrei
that determines when rosh hashanah is
it's ironic
that the one mile of the year that we
don't announce out loud
is the myelin of tishrei the minig most
keyless is to announce the milad on
champs of arkham which we have every
month
though that announcement really does not
impact
the rosh haidish what impacts
is the mileage of tishrei and then the
months fall into place tishrei of this
year this week of next year and then
everything lines up
as is and again in kislev you have to
you have to base on how many days in the
year you need but the shasta milo really
doesn't make a difference passions we
announced to milo
it's proper to know the time of the
mileage there is an important point of
knowing the milan and that is for the
recitation of kinish lavonna which we'll
briefly mention it's really suggested
that members but briefly you can only
say kervana at the earliest
only three days after the shasta milan
that's the earliest okay we're not going
to get into al-aqsa if you wait for
months of shambhas and or some have a
minute to wait longer the shibuya brings
down the earliest possible time to say
the the kitchen of honor is three days
after the milan the latest time the
ramos says based on the my reel
is halfway between one mainland and the
next now you'll understand what the rama
means
in
cement
where he says you could say kineshlavana
you know what that means that means
halfway between one myelin and the next
huff tests are the days your days are
the hours
sag are the number of
seven hundred and ninety three khalakkem
the ramada doesn't deal with minutes
drama deals with
only khalakkem
for an hour and therefore in an hour an
hour has one thousand eight khalakhim 44
minutes and one helix is equivalent to
793 khalakim
and therefore the the khatsi khaftas
your face
means halfway between halfway up 29 days
12 hours 44 minutes and one heilig which
is
14 days 18 hours
22 minutes and a half of helic
from the shasta my lod
that's how much time you have to say
kenishavana
for
again
after after the three day mark but from
the shasta milan after you've passed the
three-day mark you have from the time of
the mighty line up to the latest time of
14 days
18 hours 22 minutes and helix so the
shasta mileage is important in
determining
the seif's man kirishlavana the latest
time for the recitation of kenoshavana
now they're complicated
with the time which we're not going to
get into but exactly
is is the time you shall lying exactly
the same time that it was as the my life
time
dictates there have been times change
changes to the clock over the years
that's one issue the second issue in
allah deals with is do you have to
subtract the hours that's the
shasamayala time in yushalayam in let's
say
new york
it's seven hours back so the shasta my
life that they announced is you shalom
time but we're really seven hours
earlier
so do you have to for kids sylvanas says
do you deduct those seven hours this is
a a lengthy discussion
but one just we could appreciate exactly
the mechanics of this discussion and
exactly what the issue is at hand
because now we have a better
understanding of
of of the shasta milan
one other important point is that we
mentioned that the days
of every month are kavula are set with
the exception of kashmir cashmere
kislife 29 days or 30 days the poisskin
speak about why was hydrogen and
kisslife chosen some say it was early in
the year but another reason given
is because
in the summer you would run into
problems if you start changing the
number of days of the month for example
during sphero if you were to change ear
or or
nissan and you would have a different
day of schwelis because it's the 50th
day of sphero and if all of a sudden you
make ear 30 days is going to be a
different day
and the summer is an issue because of
the set number of days that happened
between shush vasa matamus and then
between thomas and
el in the 40 days imagine being on rc
night you don't want to tamper with
aldor the number of days between purim
and pesach so reject and kiss slave are
safe so to speak they're they're not in
any problematic time
though we can ask a question on this
because the fact that kiss slave
sometimes 29 days sometimes 30 days
leads to some confusion because if a
person was born on the eighth day of
hanukkah
their birthday is not necessarily the
bar mitzvah is not necessarily going to
be on the eighth day of hanukkah because
the eighth day of hanukkah could be the
second or third of teves if there's 29
days in there's only 29 days in kislev
then the last day hanukkah is kimmel
teves and if there's 30 days then the
last day of hanukkah will be based so
it's the gay yard sites the the the the
notes be careful if a person has yard
said it and the hanukkah don't go by
today you have to go by the entires a
person could have a yard sign on gimelte
base and the and the terror took place
on the last day hanukkah but yet in some
years the art side said they have to
hanukkah so it's confusing so what's
that what's the shot
so i was thinking perhaps we could
answer
by saying that
we know that the venom took away
dish mila and shabbos
mila
of course is is
such an important mitzvah
it's it's a hallmark of every jewish boy
and shabbos of course is shabbos is
school can i call a torah it's so so
important
why do they pick rish khaidesh
they pick rich because they wanted to
tamper with the young taiwan if we don't
know what rosh haidesh is we don't know
when sukkas is we don't know what pesach
is we don't know what purim is
such a fundamental part of the year and
they tampered with it to attempt to
confuse claudia into not knowing
when rich is and therefore when yanta is
and when the bar mitzvahs are in your
sights and we live by the days we live
chrysler lives by the by the calendar
and therefore they tampered with it
so perhaps
to
we go ahead and we when is the ticking
of the calendar
next rosh hashanah
hibaleno taiva as we mentioned the tough
shape gimbal is going to be on a monday
because the my lot is going to be on
sunday night
so
how do we make sure that that happens
you know l is going to have 29 days
however our shuttle is going to be on
sunday next year how do we make sure
that happens it just doesn't just occur
the answer is we make sure to make
freshman restricted slave one day for 29
days and kiss slaves 30 days and by
doing that and then the rest of the
months follow the regular pattern ah now
rosh hashanah
so technically it's during heidi's
kislev that we're conveying the calendar
for the rest of the year
where kaiveh starting with the with
restrainers kislev by being one day
that's the beginning of the
of the
ticket of the calendar so that it's
fixed
properly for the year
and the makha mapatis the final nail to
ensure that next rosh hashanah occurs on
the proper day occurs right in the
middle of hanukkah we're gonna have a
30th day of of kiss slave and then aleph
teves and now we're set we're good to go
tavis will be 29 days shout out will be
30 days we'll have a nibble yard and
that makes sure that the calendar so
during hanukkah
when the when the ivanim wanted to take
away
this from us they wanted to of course
which always falls out during hanukkah
it's no coincidence but it's more than
that the rest is significant because
that's the reshredish that is kaveh the
calendar for the entire year every
single year it's during hanukkah so
specifically during hanukkah we go ahead
and we're massacring it because the the
euvonim wanted to take it away from us
the kashmir name stopped that and
therefore until this day we're able to
be kevin
based on ghazal based on
and celebrate the entire in their proper
time
you