3. Lo Adu Rosh, The Other Dechiyos & The International Dateline

[Applause] [Music] in the last session we discussed that the primary mylad is the mylat of tishrei and the day of the mylad is going to determine rosh hashanah and then we know roshana of the following year and then the entire year falls into place the gemara rosh hashanah discusses because the might that occurs on a certain day does not necessarily mean that rosh hashanah is going to occur on that day the gemara says the gemara says that there are certain times where we push off rosh hashanah not on the day of the milan allah says we do this which means as follows if rosh hashanah were to fall out on a wednesday then that means yom kippur would fall out on a friday if rosh hashanah fell out on a friday then that means yom kippur would fall out on a sunday the the gemara here is saying that we're going to run into into serious problems just we're giving just a basic understanding here of where's where this gemara is the gala misa and that is yum kippur we can't have two days of shabbos shabbat shabbat in a row we have shabbos every week if yom kippur were to fall out on a friday or a sunday we would run into into problems number one problems of yarkia yarqui are vegetables you can't cook for two days so if a vegetable was picked on a regular yantov you could cook you could cook when they have to have shilan on friday and so on but here you're going to run to this problem you can't cook the vegetable it's going to go bad massa is if someone died let's say your kipper was on a friday if someone passed away thursday as yom kippur began he can't be buried for two full days and therefore we want to go ahead as the gomorrah says we want to go ahead and we want to push off elo in a way to ensure that yom kippur doesn't fall on a friday or sunday this means we push off is is known as we've often learned this rule but the gemara rosh hashanah brings to light the reason for this rule le adu raj means that rosh hashanah cannot fall out on a sunday wednesday or a friday why would rosh hashanah fall out on a what sunday wednesday or friday the answer is the mylad if the milad fell out on sunday technically rosh hashanah should be on sunday if the milot fell on wednesday of tishrei then technically rosh hashanah should be on wednesday no we're not going to let that happen because if rashad falls on a wednesday yum kippur is on friday and we cannot have two days of shabbos in a row as we've said just to give another example it's not the gemara's example but imagine if kevin was on friday when would women bench look for friday it would be impossible you couldn't bench look because it's your kipper you can't bench look how would you cook for shabbos you can't because you've kept it out to cook at all so you would run into serious problems again the gemara gave up gave these two examples so we cannot allow rosh hashanah to fall out on wednesday or friday or on sunday and the reason on sunday is because then hashana rabbah would fall out on shabbos and if i shot a rabbit would be on shabbos we would not be able to take the hashanas and we perhaps would forget texas and sukada began giving him a base explain asakasha we let rosh hashanah fall out on shabbos and we don't call shaiphur and yet the meaning the vietnam of hashanah's that we push off a calendar think about it the mueller of tishrei occurs on sunday and we go ahead and we push off rosh hashanah to monday because of hashanah's remember not only is roshana getting pushed off but all the um type of sukkah is pushed off the previous purim is pushed off pesach has pushed offshores everything gets pushed off because of this so we do that just for hashanah so thais gives two answers one is that is that rosh hashanah shaiphur no no one's ever gonna forget shaiphur because it's in the passage whereas hashana is a minig if you stop doing it one year people next year will say oh it's not our meaning we don't take a shot so to avoid that we always make sure not to allow ishana rabba to occur on on a shabbos the other reason is that we have a secondary rosh hashanah so chauffeur schaefer wouldn't be forgotten because the second day rosh hashanah that we will take we will blow shaiper whereas hashanas it would fall on shabbos that year it would be skipped and therefore hazal were afraid that it might be forgotten about so for just this example in tafsi magdalen 2003 the mainland of of tishrei fell out on on friday it was friday uh early friday morning but rosh hashanah was shabbos tough because we don't let this happen and therefore we push off rosh hashanah now in the last session we spoke about roshana the year being a certain amount of days so the way you calculate is you calculate the mileage of this year with the trees the myelin of next year with the trees you determine what day roshan is supposed to be and then you fill in how many days of the year are required you also have a mild zaking milotzokin is discussed in detail on as well and we're going to explain the balabal aura's explanation of of the military means right it's it's a suggy here that the signing beside it's a complicated sugiya here but we're going to explain the bala more explanation of of this sugiya and exactly what means the mullet occurs at 12 noon or later if the mileage occurs at 12 noon or later then rosh hashanah is pushed off to the next day for example in tough shampoo the my life of tishrei 2025 the my life tishrei is going to be on monday shortly after after noon right about a little more than 10 minutes afternoon so it's too late for rosh hashanah to be on monday rosh hashanah has to be on tuesday or charlotte will be on tuesday because it's a militant it's an old milan the simple explanation is that we're trying to we're trying to replicate the sanhedrin you can't see the new moon for a certain period of time so if the mile is occurring after 12 noon it's not going to be visible that day so we can't make rosh hashanah that day and therefore our shun is pushed off to the next day sometimes it's pushed off another day for example in tough shania and zion the my life 2016 the money that occurred on shabbos afternoon after after 4 p.m excuse me after 2 p.m on shabbos afternoon so we had a doubled here because charlotte's afternoon my ozaki it has to be the next day next day it was sunday i do rush so it has to go until the next day and therefore rosh hashanah was pushed off until monday the baltimore explains this gemara that it takes 24 hours to see the new moon takes 24 hours and somebody in the world has to see the new moon on that day the world the western tip of the world is 270 degrees west of yusulim 18 hours west which is the same line as six hours to the east 90 degrees east of shalom it's a line that runs through china and australia and if you're standing on the eastern side of that line you're on the western tip of the world at that point it's going to take 24 hours anywhere it's going to say 25 hours to see the milad if it's still monday at that point then you can make rich so if the money occurs 11 59 a.m the time on the western tip of the world is 18 hours back let's say it's monday it's the my life occurs 11 59 a.m on monday okay the time in that line is 5 59 p.m on sunday it's 18 hours back it'll be seen 24 hours later which is 5 59 p.m on monday so rosh hashanah is on monday however if the milo is at noon that means even on the western tip of the world the myelin will not be seen by anybody the new moon cannot be seen by anybody until it's already monday night 6 pm the average skier time that's it roshana cannot be monday roshan has to be pushed off until tuesday until the next day interestingly enough is this paloma or is the source of the international dateline the opinion of the hazarish of where the international dayline is and that is this line 90 degrees east of ushalayam is the line because in the discussion obama already saying the western tip of the world the latest or the earliest time so to speak the last possible place on earth he's saying is 18 hours west of you shalom which is six hours east of you shalom that would be the international date line if the hazard says you cannot have a line going through land and therefore he goes ahead based on the site islam atomic rush and therefore the line goes around the coast of asia and the coast of australia those are on the israeli those are strong side that side and then everything to the east is on the american side including japan and new zealand so this is where the whole issue of the shiloh of the of the date line comes up of course 80 years ago this bastion kippur this was the shia land kobe japan with the talmidam of the mir that this came up exactly where is the international daylight but the basis there are two other drives one of the is known as as get red before the two other trees the mild sake is only a rule by rosh hashanah you could although rarely you could have a monolith zocaine on other months for example in the milot of shvat is going to be at 3 21 p.m on rosh haidish in 1902 it happened as well the mighty shot was at 4 45 p.m in seven khalakam on rish heidesh well after 12 noon so this rule only applies to tishrei the last two degrees are known and one is called get raid get raid means that the mileage occurs that at the ninth after the ninth hour two hundred four khalakim gimel is tuesday test is nine hours the day begins at 6 p.m so this is roughly 3 a.m and 204 kalakam into the day which means if the mightlet occurs on tuesday after the ninth hour which is after um 3 am and 204 khalakkum then rosh hashanah is pushed off to thursday in other words this is before noon the might that occurs at 3 a.m and 204 khalakum or later roshan is going to be pushed off can't be wednesday so it has to go to thursday the reason for this here is without it it would come out if you did the calculations you would need 356 days in the year which we don't have we only have 355 at the most therefore to avoid this problem rosh hashanah has pushed up making the year shorter and therefore we're able to facilitate that year it actually becomes a 350 instead of 356 we move it up two days the year becomes 354 days and we give away a couple days to the previous year the last year which will not happen again between now and 6 000 is known as the tutakat akara get raid is only in the shanab shooter it's only in a regular year the two tak part is if the mileage occurs at monday fifteenth hour five hundred rosh hashanah will be pushed off 15th hour is um sometime after nine am and five hundred eighty nine khalakim then rosh hashanah is pushed up to the next day to tuesday and the reason for this here is after an ibra yard without this tria the previous year would have to be 382 days which we can't facilitate we need at least 383 so we make rosh hashanah um a day later and by doing that we ensure that the previous year works and has 383 days and therefore it all works out so those are the four degrees that we have a side topic of this is international dateline we have to rush roshana cannot be on sunday wednesday or friday if the milo occurs then it's pushed off milo zucchini if tomorrow is at 12 noon or later then rosh hashanah is the next day or the day after that if you have if you have a leather rush and of course get raid and get we also have as well to ensure that rosh hashanah will work out in a proper manner