Activa JavaScript para disfrutar de los vídeos de la Mediateca.
Imaginary lines - Contenido educativo
Ajuste de pantallaEl ajuste de pantalla se aprecia al ver el vídeo en pantalla completa. Elige la presentación que más te guste:
Types of Earth's imaginary lines
Hello kids! Today, in social science, we are going to learn about imaginary lines.
00:00:00
As you can see, in this globe, there are many lines, but they are not drawn on the Earth's ground or on water.
00:00:07
They are invisible, so we can't see them. But what are these imaginary lines for?
00:00:17
On maps and globes, there are invisible lines, imaginary lines, that we use to describe a location on the Earth's surface to find a place on Earth.
00:00:25
So, they tell us where exactly a place is on the Earth's surface.
00:00:38
Imaginary lines are very useful for pilots when they are flying a plane.
00:00:46
They use imaginary lines.
00:00:52
So, this pilot knows he has to go to that green point, but how can he go there?
00:01:02
There are not signs floating in the air, there are not stop signs, right and left signs.
00:01:12
For that, he uses imaginary lines.
00:01:18
So, he knows he has to go to the east, but where exactly?
00:01:23
northeast or southeast the imaginary lines will help him there are two types of imaginary lines
00:01:29
longitude lines which are long they are long and they go from the north pole to the south pole
00:01:40
they run north to south so they are vertical lines and latitude lines
00:01:49
latitude lines are lateral they run east to west they are horizontal lines
00:01:58
let's start with lines of longitude which are also called meridians as i said before they are
00:02:08
vertical they are long and they run north to south but let's find out more about them
00:02:19
so as you can see there are many lines of longitude and as he said to identify them
00:02:27
we number them and the main meridian the meridian in the center is the prime meridian
00:03:24
this meridian is also called greenwich the greenwich meridian because it passes through
00:03:31
the city of Greenwich in the United Kingdom and it's the zero degrees meridian but what's that
00:03:39
what's a degree in this case degree is not temperature it's a unit of measure which
00:03:47
measures how far away we are from the center one degree is 111 kilometers zero degrees is the
00:03:56
center and we can move away to the east 10 degrees east 20 degrees east and so on 30 degrees east 40
00:04:04
degrees east but we can also move away to the west 10 degrees west 20 degrees west so meridians
00:04:15
measure distances east and west this is meridian 10 degree east and meridian 10 degree west
00:04:22
Okay, let's sum up.
00:04:32
As I said before, meridians are vertical lines that run north to south,
00:04:37
and they measure distances east and west.
00:04:43
So, we know that one degree is 111 kilometers.
00:04:48
If we need to find out how far away the 20-degree east meridian is from the center,
00:04:53
from the Greenwich Meridian, we have to multiply 20 times 111 kilometers, that's
00:05:03
2220 kilometers away from the center. Is it enough information for the pilot to
00:05:16
know where he has to go let's see no it's not enough because he knows that he
00:05:29
has to go 30 degrees away from the center to the east but does he have to
00:05:43
go down there or up there he also needs the information of lines of latitude
00:05:52
which are also called parallels. As I said before, parallels are horizontal
00:06:02
lines that run east to west and let's find out more about them.
00:06:12
So again there are many parallels, many lines of latitude and
00:06:24
And to identify them, we number them.
00:07:04
The main parallel is in the center.
00:07:10
It's zero degrees, and it's also called the equator.
00:07:13
So, the equator is in the center, and we can move away from the equator to the north or to the south.
00:07:18
So, for example, we can see in this globe that the North Pole is 90 degrees north.
00:07:25
It means that it's 90 degrees away from the equator and it's to the north.
00:07:40
And to sum up, we can say that parallels are horizontal lines that run east to west
00:07:51
and they measure distances north and south.
00:07:57
Now the pilot has enough information.
00:08:08
He's going 20 degrees north and 30 degrees east.
00:08:12
That's a geographic coordinate.
00:08:17
So 1 degree is 111 kilometers
00:08:23
and he's going 20 degrees north.
00:08:26
So we have to multiply 20 times 111.
00:08:30
That's 2,220 kilometers away from the center, from the equator.
00:08:34
And he also has to go 30 degrees east.
00:08:41
That's 30 times 111.
00:08:45
3,330 kilometers away from the center, from the Greenwich Meridian.
00:08:50
Now the pilot knows exactly where he's going.
00:08:58
ok, this is it
00:09:02
I hope you understood it
00:09:05
and now you have to practice
00:09:07
bye bye
00:09:08
- Idioma/s:
- Autor/es:
- Noemí
- Subido por:
- Noemi C.
- Licencia:
- Dominio público
- Visualizaciones:
- 347
- Fecha:
- 17 de enero de 2021 - 14:52
- Visibilidad:
- Público
- Centro:
- CP INF-PRI NTRA. SRA. DE LA MILAGROSA
- Duración:
- 09′ 10″
- Relación de aspecto:
- 2.18:1
- Resolución:
- 1568x720 píxeles
- Tamaño:
- 283.44 MBytes
