Amazing

2. by RON KURTUS 18 June 2010
and MATT WILLIAMS 21 Nov. 2014

4. The
spinning
of an
object on
its axis.

5. The Earth
spins on its
axis from West
to East
(counter-
clockwise).

6. The spin axis
of the Earth
undergoes a
motion

7. This changing
of direction of
the spin axis is
called
PRECESSIO
N

9. It takes the Earth
23 hours, 56
minutes, and
4.09 seconds to
complete one
full turn.

10. Day and night
are produced
by the rotation
of the Earth.

11. The speed of rotation
at any point upon the
equator is at the rate of
approximately 1,038
miles per hour,
decreasing to zero at
the poles.

12. The Earth's polar
axis tilts at an
angle of 23.5°
with its orbital
plane around the
sun.

13. This
declination is
responsible for
the seasons
experienced on
Earth!

15. SUMMER WINTER

16. SUMMER
The sunlight
shines more
directly on the
Earth and less
sunlight is
reflected
WINTER
The angle of the
sunlight is
steeper, resulting
in more light
being reflected

17. SUMMER
Summer
daylight
hours are
longer
WINTER
Winter
daylight
hours are
fewer

18. SUMMER
In Northern and
southern
hemisphere, sun
goes more nearly
overhead.
WINTER
For Northern and
Southern
hemisphere, in the
winter we look to
the south to see the
Sun.

19. SUMMER WINTER

20. Seasons are
reversed in the
Northern and
Southern
Hemispheres.

23. The solstices are
days when the Sun
reaches its farthest
northern and
southern
declinations.

24. While,
equinoxes are
days in which
day and night are
of equal
duration.

26. Summer Solstices: The Sun is farthest north
and the length of time between Sunrise and
Sunset is the longest of the year.
Winter Solstices: The Sun is farthest south and
the length of time between Sunrise and Sunset
is the shortest of the year.

27. Autumn Equinox :The first day of the
Season of Autumn - and the beginning of a
long period of darkness at the Pole.
Spring Equinox The first day of the Season
of Spring - and the beginning of a long period
of sunlight at the Pole.

29. The
movement
of the
Earth in its
orbit.

30. The Earth
is revolving
around the
Sun in a
counter-
clockwise
direction.

31. It completes
one revolution
every
365.242199
mean solar
days.

32. It travels to its
path is known
as the
Earth's orbit
that has an
eccentricity of
less than 0.02

33. It means that
the orbit is
very close to
being
circular.

34. The average
distance of the
Earth from the
Sun is about
93 million
miles but it
varies as it

35. Perihelion Aphelion

36. The speed of
the Earth’s
orbit around
the Sun is
108,000
km/h.

39. The Earth also follows the
Sun's movement through the
Milky Way Galaxy.

40. The Sun and its planets are
moving toward the star Vega at a
velocity of about 12 miles per
second.

41. The Sun and Vega are rotating
about the center of the Milky
Way at about 150 miles per
second.

43. The Moon has a
nearly circular orbit
(e=0.05) which is
tilted about 5° to the
plane of the Earth's
orbit.

44. Its average
distance from the
Earth is 384,400
km

45. It takes the Moon
27.322 days to go
around the Earth
once.

46. The Moon appears to
move about 13°
against the stars each
day, or about one-
half degree per hour

47. The same side of the
moon always faces
the Earth.

48. Because of the effect
on the Moon of tidal
forces due to the Earth

49. It takes the Moon the same
amount of time to rotate
around once as it does for the
Moon to go around the Earth
once.

50. The Moon appears
to go through a
complete set of
phases as viewed
from the Earth
because of its
motion around the
Earth .