CIENCIAS DE LA NATURALEZA1º DE E.S.O. PRIMER TRIMESTRE

FIRST TERM

Chapter 2:

The Earth in the universe

http://forums.yoyogames.com/forums/3/topics/62440 https://planetary.org/images/Blue_Dot_big.jpg

Planet Earth seen from the Voyager 1 in 1990

2.3. EL MOVIMIENTO DE ROTACIÓN

2.3.1. EL DÍA Y LA NOCHE

http://www.youtube.com/watch?v=qqoAEKVRu00&feature=related

Click see and answer …

¿Puede ser la misma hora en todos sitios?

HUSO HORARIO: ZONA ENTRE DOS MERIDIANOS CONSECUTIVOS

Longitude and TimeLongitude and TimeIf you place meridians 15° apart starting with the Prime Meridian, If you place meridians 15° apart starting with the Prime Meridian, you will divide the Earth into 24 zones. These correspond to the you will divide the Earth into 24 zones. These correspond to the 24 hours in a day.24 hours in a day.

http://www.mapsofworld.com/time-zone-map/maps/world-time-zone.jpg

2.3. THE ROTATION MOVEMENT

As you travel around the world to the east, you gain As you travel around the world to the east, you gain an hour in time for each zone you cross. If you an hour in time for each zone you cross. If you travel to the west you lose an hour.travel to the west you lose an hour.

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

• THERE IS A 1 HOUR TIME DIFFERENCE FOR EVERY 15° OF LONGITUDE

• The world rotates (spins) 360° in 24 hours.

360° / 24 hours = 15° per hour

• The world has 24 time zones, each l5° apart.

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

• EAST INCREASE

Time is forward to all places to the east • WEST LESS

Time is backward to all places to the west

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

If it is 9 p.m. at Position D, what time is it at position C?

Position B?

East Increase – West Less(1 hr per l5°)

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

If it is 9 p.m. at Position D, what time is it at position C?

Position B?

East Increase – West Less(1 hr per l5°)

5 p.m.

3 p.m.

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

If it is 1 p.m. at Position X, at which location is the time 5 p.m. ?

East Increase – West Less(1 hr per l5°)

2.3. THE ROTATION MOVEMENT

http://www.astro.ufl.edu/~oliver/ast3722/lectures/CoordsNtime/timezon2.gif

East Increase – West Less(1 hr per l5°)

5 p.m.

If it is 1 p.m. at Position X, at which location is the time 5 p.m. ?

2.3. THE ROTATION MOVEMENT