SPACE MOTION EARTHCENTRED UNIVERSE In ancient times many

EARTH-CENTRED UNIVERSE • In ancient times many people though that the Earth was the

SUN-CENTRED SOLAR SYSTEM l 500 years ago people began to question the idea of

2 SOLAR SYSTEM MODELS 1. Geocentric – 2000 years ago • Earth is the

EARTH’S ROTATION • The motion of the sun in the sky is caused by

REVOLUTION • Revolution is the movement of one object around another • It takes

WHY DOES THE EARTH HAVE SEASONS? • A. Earth’s orbit is further away from

THE REASON FOR THE SEASONS • The Earth is tilted on it’s axis 23.

NORTHERN HEMISPHERE SUMMER More daylight hours, more direct sunlight https: //www. youtube. com/watch? v=KUU

TIME ZONES 1. Time Zones – not all areas experience day and night at

MOTIONS OF THE MOON • rotates on a axis • The moon also revolves

MOON’S MOTION • Together the earth and moon orbit around the sun

PHASES OF THE MOON • The same side of the Moon is always facing

PHASES OF THE MOON • The Moon rotates around it’s axis once every 29.

PHASES OF THE MOON • The Moon revolves around the Earth once every 29.

INTERESTING FACTS… • When there are two Full Moons in a month the second

3. TIDES • Due to the pull of gravity by the moon https: //www.

APPARENT MOTION OF CELESTIAL OBJECTS • the stars appear to move across the sky

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SPACE MOTION

EARTH-CENTRED UNIVERSE • In ancient times many people though that the Earth was the centre of the Universe and that all other objects revolved around it.

SUN-CENTRED SOLAR SYSTEM l 500 years ago people began to question the idea of the Earth. Centred Universe. l Around 1550, Copernicus showed mathematically that the planets all orbited around the Sun.

2 SOLAR SYSTEM MODELS 1. Geocentric – 2000 years ago • Earth is the centre of the universe 2. Heliocentric – present model • Sun is the centre of the solar system

• Why Do we have sunsets?

EARTH’S ROTATION • The motion of the sun in the sky is caused by the rotation of Earth on its axis • A rotation is 1 spin on Earth’s axis • 1 spin = 1 day

REVOLUTION • Revolution is the movement of one object around another • It takes Earth one year to revolve around the Sun along its orbit

WHY DOES THE EARTH HAVE SEASONS? • A. Earth’s orbit is further away from the sun during the winter and closer in the summer • B. The tilt of Earth’s Axis causes the seasons • C. The tidal changes in the ocean as a result of the moons revolution causes the seasons

THE REASON FOR THE SEASONS • The Earth is tilted on it’s axis 23. 5° • Earth tilted toward the sun = summer • Tilted away from the sun = winter

SEASONS

NORTHERN HEMISPHERE SUMMER More daylight hours, more direct sunlight https: //www. youtube. com/watch? v=KUU 7 Iy f. R 34 o&list=PLWq. GSm 739 tks. DYzz. Y 6 rmi 3 OTBRd. Wp. VX 3&i ndex=3

TIME ZONES 1. Time Zones – not all areas experience day and night at the same time

MOTIONS OF THE MOON • rotates on a axis • The moon also revolves around the earth • The moon rotates on its axis in about the time it takes to revolve around the earth • Therefore we always see the same side of the moon

MOON’S MOTION • Together the earth and moon orbit around the sun

PHASES OF THE MOON

PHASES OF THE MOON • The same side of the Moon is always facing Earth.

PHASES OF THE MOON • The Moon rotates around it’s axis once every 29. 5 days. • Moon Phases: Crash Course Astro #4 • https: //www. youtube. com/watch? v=A Q 5 vty 8 f 9 Xc National Geographic http: //video. nationalgeographic. com/vid eo/101 -videos/moon-101 -sci

PHASES OF THE MOON • The Moon revolves around the Earth once every 29. 5 days.

INTERESTING FACTS… • When there are two Full Moons in a month the second one is called a "Blue Moon".

3. TIDES • Due to the pull of gravity by the moon https: //www. youtube. com/watch? v=Kl. Wp. FLf. LFBI

APPARENT MOTION OF CELESTIAL OBJECTS • the stars appear to move across the sky from east to west • However, the apparent motion is caused by Earth’s rotation