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8 ra"eap'mean? Whyim thie yearcamed
alem
mWhatdoes the W
leap yegr
y knowg there
2016jsal are usually 865 daya in ayear、 365
365 d
ut that.
The ye8r
verybod
rat learn abo day of the week Yshifts one day
me day.
xfell on Wedne
2016 then? Saturday? No
eap' and the ye8T which has the leap ja called g
ear comes, tho 5
POr
yemr?
sday in 2014 and on Rday in 20
So when a now y
sday 2013, on Thuri
[Ria【Sundgy| 時1
] 呈
1eap year。 Sothie year ia chai
ュ
62 weeks and o
mas Day
are
example, Christi
What day 8 Christmas Day 反
jump ia aed
Jeap ye8r・
ayear which has one *extra day
why does this ieap happen? 「EYo four yeare, we have
That extra day CaU868 the leap、 The extra day iscalled a ]oap day。 and we have it in February
do we hnd a leap yenr? the yegr 好 jiiimible by four that year 9 a leap year。、Ror
ample 2016 jadiysible by four soita aleap 79計 [- _@5
How about the year 1900?. not a leap year、 It was a
Do you know the reason? Today the
Tt *ia based on the *movement of the carth around the
1900 is divisible by four。but i Wa8
Ca KGreg6riam Calendar ia used in many counties
around the world」 and it etarted in 1582.
the Gregorian calendar, people already knew that one Year jia a Hittle 1onger than 865
Calculated agam and agsinand fnally they found that the earth goes
gun。 Before
days。 Some scientists
And the aun in 365.2422 days。 This means 365 daya and about eix houre. So every year ij
about six hours longer than 865 days, and after four year8, the extra time *adds up to 24 hours (one
day)。 But there is still some small difierence because each year is a httle shorter than 365 days and
six hours8、 TO *make up for the difference, three rules were made.
Rule 1: fthe year ig divisible by 4 s a leap year.
But we aleo have to follow these two rules.
Rule 2: fthe year jg divisible by 100, is a common year
Rule 3: f the year ia divigible by 400, 辻 ja a leap year.
From the 1
ese three rules, we wl know the years 2000 and 2400 are | (3-a) | years, but 2100, 2200
and 2800 are | (3-b) | yeare. Now you know why the year | 4
Wa a common year.
There are dift
0 e と "calendara all over the world。 We can fnd different leaps in them。、
ら ma i ・ に
8 和 eir calendar by using the movements of the sun and the moon。 Their calendgr
ren1 ュ ・
*Inatead, they 2 the Gregopan calendar There ia no 1eap day in the Chinese calendar.
eap month。 They put gi し
19 monthsinayemrl It goes hike (January rother month mn the calendar, so sometimes there aTG
Im Japan,
80 day8.
calendar,
the od cendarin Edo pen cbruary March Teap March、 Apri May 。
0ne year had 354 da 198 Yag Hike the Chinese calendar。 One month had 29
After three yeara 了 had 11 daye fewer than a common year of the Gregonmm
) erence adde up to 88 days、 Thia im about one month。 0!
-6・
ti
