Units

of

time

second

1/60

of

a

minute

minute

60

seconds

or

1/60

of

an

hour

hour

60

minutes

or

1/24

of

a

dayw

day

24

hours –

the

time

it

takes

for

the

Earth

to

rotate

once

on

its

axis

week

Seven

days

or

about

1/4

of

a

month

month

About

30

days,

or

1/12

of

a

year –

the

time

it

takes

for

the

Moon

to

travel

around

the

Earth

season

Spring,

summer,

autumn

and

winter –

each

season

is

about

90

days

long,

or

1/4

of

a

year

year

365.25

days –

the

time

it

takes

the

Earth

to

travel

around

the

Sun

decade

10

years

century

100

years

millennium

1 000

years