

On page 65: fold page in ½ make 4 doors.
Objectives:
 Identify the relative positions and motions of the
Sun, Earth, and Moon
 Describe the phases of the Moon.
 Distinguish between solstices and equinoxes.
 Explain eclipses of the Sun and Moon.
1. Galactic/ Cosmic Year:
The length of time it takes solar system to circle
around the Milky Way approximately
225,000,000 years
Milky Way Galaxy
We are located in a spur off
the minor Sagittarius Arm.
Our local region of the
galaxy is typically known as
the Orion Arm
2. Precession of Axis or "Wobble"
effect: approx. 26,000 years

Polaris is our current North Celestial
Pole Star.

13,000 = Pole Star will be bright star
of Vega , in Lyra constellation

26,000 years = Polar Star will be
Polaris again
3. Revolution: Earth takes 365 days 5 hours 43
minutes or 365 1/4 days to revolve around
the sun. This gives us our "year".
4. Rotation: Gives us our "day".
Sidereal Day:
Earth’s rotation in relationship
to a star. Sidereal day is
23 hrs 56 min 4.1 sec. long
Solar Day:
Earth’s rotation in relationship
to the sun. Solar day is
24 hours long.
Summer Solstice:
Longest day of the year in Northern
Hemisphere is June 21.
Sun tracks as far north as Tropic of Cancer
23 1/2° N of equator
Fall Equinox:
Equal day/night.
Sun tracking over celestial equator, Sept. 21.
Winter Solstice:
Shortest day of the year in Northern
Hemisphere, Dec. 21.
Sun tracks as far South as Tropic of Capricorn,
23 1/2° S of equator.
Spring Equinox:
Equal day/night.
Sun tracking over celestial equator,
March 21.

NEW MOON

WAXING CRESCENT

FIRST QUARTER
Moon is directly between the Sun and
Earth. Far side is lighted. Near side is dark.
We see the dark side.
A sliver of moon's near side is lighted.
Lighted semi-circle. 1/2 of moon is
lighted. We see only a 1/4 of it.
Add this one tab foldable to the top of
page 69 . Add what is below under the
tab.
Describe a lunar
month vs. a
lunar day.
Lunar month = New Moon to
New Moon. Also called a
synodic month = 29.5 days
A lunar day is 27.3 days long.
This is the time it takes for the
moon to return to the same
spot in the sky relative to the
stars. Also called a sidereal
month.
Add this one tab foldable to the
top of page 69 . Add what is below
under the tab.
The Moon’s orbit forms an ellipse,
an elongated circle.
Apogee: Moon is farthest away
from Earth
Perigee: Moon is closest to Earth.
Describe the Moon’s orbit
around Earth.