Spermiogenesis or Spermateleosis or metamorphosis of spermatid
Earths Tilt and Seasons.pptx
1.
2. What is Astronomy?
Astronomy is the scientific study of
matter in outer space.
It is known as the 1st science
because of written astronomical
observations by the Babylonians
around 1600 B.C.
3. Earth, Moon, and Sun.
The Moon revolves around the
Earth.
The Earth revolves
around the Sun.
4. Earth’s Orbit:
Earth’s orbit (path) around the
sun is NOT a perfect circle.
Earth’s orbit is an elongated
circle, or an ellipse.
12. Planet Revolution Rotation
Mercury 88 days 58 days
Venus 224 days 243 days
Earth 365 days 24 hours
Mars 687 days 24.6 hours
Jupiter 12 years 10 hours
Saturn 29 years 10 hours
Uranus 84 years 18 hours
Neptune 165 years 19 hours
*Pluto 248 years 6 days
13. Reason for the Seasons:
Earth has
seasons because
its axis is tilted as it
revolves around
the sun.
15. Earth’s Tilt and
Seasons:
When a part of Earth tilts toward the
Sun, the Sun is higher in the sky and
its rays hit that section at a higher
angle = rays are closer together =
more effective at heating Earth.
16. Earth’s Tilt and
Seasons:
In June, the Northern
Hemisphere of the Earth
(where we live) is tilted
toward the Sun = summer.
The Southern Hemisphere
= winter.
17. Earth’s Tilt and
Seasons:
In December, the Northern
Hemisphere of the Earth is
tilted away from the Sun =
winter.
The Southern Hemisphere
= summer.
18.
19. Earth’s Tilt and Daylight:
The tilt of the Earth effects the
length of daylight.
Higher sun = more daylight =
more time for Sun’s rays to
heat Earth.
20. Summer Solstice:
Around June 21st is the
longest day and highest angle
of sunlight.
It is known as the
summer solstice.
