Knowledge 6 Lesson 2/EARTH AND THE SUN!

hi guys so in our knowledge unit we are

continuing to learn about astronomy now

this is our second lesson in our

astronomy and we are learning about the

earth and the Sun as you can see we have

a beautiful picture here that looks like

what you might see if you're out there

looking at Lake Erie and out in the

distance there you see the Sun and I am

going to read to you the story and we're

gonna flip through the picture so listen

carefully okay listen as I tell you

about how the earth has some rotation

and that helps us with our daytime and

our nighttime all right all plants

animals and people rely on the Sun for

life the sun's energy gives life to

plants which in turn provides food for

animals and people the sun's heat keeps

the surface of the earth warm enough for

plants and animals to survive for people

on earth it makes sense to say that the

Sun rises in the morning each morning at

dawn the Sun appears on the horizon in

the eastern sky this right here if you

see it let's see if I can highlight that

a little bit it's not going to show up

on the picture it might not but if you

see along the edge where the water and

you can see where the water might meet

the land that's the horizon okay the

line way off in the distance at dawn

some people say look the Sun is coming

up the first appearance of the Sun above

the eastern horizon is called sunrise oh

look at that beautiful picture over the

course of the day the Sun appears to

move across the sky gradually following

its path from east to west in the

evening the Sun sets in the west

ever so slowly it gets lower in the sky

and disappears below the horizon

that's when the people say the Sun is

going down this disappearance of the Sun

below the western horizon is called

sunset so based on what we can see from

where we live on earth it seems sensible

to say that the Sun moves across the sky

each day rising or moving up in the east

and setting or sinking down in the West

but that's not actually true it is the

daily rotation or spin of the earth that

makes the Sun appear to rise and set

each day Earth rotates or spins on its

axis

imagine the Earth's axis as an imaginary

pole sticking through the center of the

planet from north to south it takes 24

hours or one day for the earth to spin

or rotate all of the way around one time

so right now I want everyone to stand up

and I want you to spin around one time

just one time and then I want you to sit

back down do it okay let's move on this

daily rotation explains why there is

always day and night on earth as it

spins certain parts of Earth's surface

face the Sun receiving its heat and

light when it is light on one side of

the earth it is dark on the other side

so if it is daytime where you are right

now then on the other side of the earth

it is nighttime and the children there

are sound asleep and when you are

nestled in your bed tonight children on

the other side of the planet will be

waking up to a bright new day I wish I

had my globe with me and we could talk

about this but I don't because I left it

in the

classroom and we're not in the classroom

but if I had my globe I would show you

because everyone on this half if it's

sunny we have daytime in this half has

nighttime okay

this spinning our rotation of the earth

however is not the only way earth moves

in space because earth is a planet it

also moves or revolves around the Sun

the word planet means a large object in

space that revolves around a star for

light earth moves or revolves around the

Sun following a constant path the path

that Earth follows around the Sun is

called the Earth's orbit earth follows

the same path as it revolves around

orbits the Sun it takes about 365 days

or one whole year for the earth to make

one complete orbit or revolution around

the Sun but how and why does the Earth

orbit the Sun the answer to this

question involves one of the most

important lessons you can learn in the

study of astronomy in space there are

large objects like the Sun and there are

smaller objects like the earth and the

moon all objects in space actually pull

on all other objects but larger objects

pull harder than smaller objects the

force that causes objects to pull on

each other is called gravity and this

pulling at objects this pulling action

happens the force of the Sun's gravity

and holds the earth in place

although Earth continues to follow its

orbit around the Sun the earth does not

wander off into space the Sun's gravity

holds the earth in place just

the Sun pulls the earth and other

objects out in space the earth pulls on

objects on or near its surface because

of this your feet stay planted firmly on

the ground and if you jump up you come

right back down if you throw a ball in

the air it falls right back down this

force of gravity holds things on the

ground and holds the planet earth in

orbit around the Sun I want you to do me

another favor I want you to stand up

before you do anything I want you to

think what will happen if I jump will I

stay floating in the air or will I come

right back down think what will happen

to me and then I want you to jump one

time jump did you stay up in the air did

you come back down if you stayed up in

the air then you must be up in space

somewhere where gravity's not all that

strong for us but if you came right back

down we have some gravity Earth's

gravity is pulling you back down let's

see what's happening here you cannot

tell that the earth is always moving as

you sit in your classroom or at home or

whatever you happen to be it rotates and

spins all day and every day as it

travels on its year-long course around

the Sun these two types of movement the

rotation and the orbit of the earth

create the day and year that we use to

keep track on our calendar I hope you

liked this lesson on astronomy today

watch the other YouTube video so that

you get more information and help us

with these topics since we can't discuss

it together and I will see you again

tomorrow ok bye now