Lee piers no they don’t happen all the
time but neither do presidential
elections but people don’t freak out
with it well it’s a presidential
election year it’s rare notes every four
years chill out we on earth as we orbit
the Sun we know how to calculate a year
is how long it takes to come back to
where you were
that’s a year but it turns out if you
cut the number of days we live into the
year it doesn’t divide evenly so there’s
not an even number of days in the time
it takes earth to go around the Sun it
takes like 365 and a quarter days to go
around the Sun so we just ignore that
quarter day just sweep it under the rug
for three years the fourth year how many
quarters have you added up four quarters
so there’s a whole day now that you’ve
saved up and in the fourth year you put
that day back in the calendar and you
give it to the neediest month February
and so this is the origin of the leap
day and this is as it was conceived in
the Julian calendar the calendar that
preceded the current calendar the
Gregorian calendar most people don’t
know that this one every four year rule
over corrects the leap day it’s not
actually 365 and a quarter day it’s a
little bit less than a quarter so you
wait four years and put in a whole day
you put in too much so you have to wait
until you put in a whole day too much
then you take out a leap day that would
have otherwise appeared so every hundred
years you have over corrected by a leap
day by an entire day so every hundred
years 100 years are divisible by four
aren’t they
every hundred years you take out the
leap day that would have otherwise been
there so 1900 was not a leap year 1800
was not a leap year 1700 was not a leap
year for this reason okay so now by
taking out that day now you have over
corrected in the opposite direction
and now there’s a day that you have to
put back in it turns out every 400 years
so every 400 years in the century year
that would have not had a leap day on
the century rule gets a leap day put
back in on the 400 year rule this sounds
complicated but it has profound
implications in the year 2000 it’s a
century year that wouldn’t normally get
a leap day but it’s a century year
divisible by 400 so you put the leap day
back in so when everyone experienced the
leap day in the year 2000 they’re saying
to themself of course it’s a leap year
it’s divisible by four it’s like no it’s
a leap year because it’s a century year
divisible by 400 they’re in is through
gorian calendar as it was established in
1582 that’s the story of the calendar
you asked okay I was sitting here
minding my own business and you had to
ask about the calendar and the leap day
time but neither do presidential
elections but people don’t freak out
with it well it’s a presidential
election year it’s rare notes every four
years chill out we on earth as we orbit
the Sun we know how to calculate a year
is how long it takes to come back to
where you were
that’s a year but it turns out if you
cut the number of days we live into the
year it doesn’t divide evenly so there’s
not an even number of days in the time
it takes earth to go around the Sun it
takes like 365 and a quarter days to go
around the Sun so we just ignore that
quarter day just sweep it under the rug
for three years the fourth year how many
quarters have you added up four quarters
so there’s a whole day now that you’ve
saved up and in the fourth year you put
that day back in the calendar and you
give it to the neediest month February
and so this is the origin of the leap
day and this is as it was conceived in
the Julian calendar the calendar that
preceded the current calendar the
Gregorian calendar most people don’t
know that this one every four year rule
over corrects the leap day it’s not
actually 365 and a quarter day it’s a
little bit less than a quarter so you
wait four years and put in a whole day
you put in too much so you have to wait
until you put in a whole day too much
then you take out a leap day that would
have otherwise appeared so every hundred
years you have over corrected by a leap
day by an entire day so every hundred
years 100 years are divisible by four
aren’t they
every hundred years you take out the
leap day that would have otherwise been
there so 1900 was not a leap year 1800
was not a leap year 1700 was not a leap
year for this reason okay so now by
taking out that day now you have over
corrected in the opposite direction
and now there’s a day that you have to
put back in it turns out every 400 years
so every 400 years in the century year
that would have not had a leap day on
the century rule gets a leap day put
back in on the 400 year rule this sounds
complicated but it has profound
implications in the year 2000 it’s a
century year that wouldn’t normally get
a leap day but it’s a century year
divisible by 400 so you put the leap day
back in so when everyone experienced the
leap day in the year 2000 they’re saying
to themself of course it’s a leap year
it’s divisible by four it’s like no it’s
a leap year because it’s a century year
divisible by 400 they’re in is through
gorian calendar as it was established in
1582 that’s the story of the calendar
you asked okay I was sitting here
minding my own business and you had to
ask about the calendar and the leap day
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