Transcript Planetary Motion

BLM 13.3a, 13.1 a,b,c
Rotation – the spinning of an
object around it’s axis.
Axis runs North to South.
One rotation of the Earth
takes 24 hours. (East)
This motion causes most stars (and the Sun,
Moon, and planets) to appear to rise in the
east and set in the west.
BLM 13.3
Revolution – the movement of one object
travelling around another.
It takes the Earth one year to travel, or revolve,
in a circle around the Sun counter-clockwise.
This motion allows us to see different
constellations during different seasons.
An imaginary line that
circles the middle of
the Earth East to
West.
This is the Equator in
Kenya, Africa
altitude 8538 ft.
1990
Why do we only see certain stars and
constellations during certain seasons?
The Earth’s Revolutions.
Why do we have seasons?
The Earth’s Revolutions.
Why does the Sun rise and set and the Moon rise
and set?
The Earth’s Rotations.
BLM 13.3a
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Solstice: A solstice is an astronomical event
that happens twice each year, when the tilt of
the Earth's axis is most inclined toward or
away from the Sun
Equinox: An equinox occurs twice a year,
when the tilt of the Earth's axis is inclined
neither away from nor towards the Sun, the
centre of the Sun being in the same plane as
the Earth's equator
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Constellations are groups of stars
Using the star maps provided, complete the
activity on page 406-407 in the text.
Draw a diagram of the Earth’s position around
the sun if….
a. You want to plan a trip to Russia in their
summer. What season would it be here?
b. You want to visit Australia in their Winter.
What season is it here?
c. You want to visit Brazil in their winter. What
season is it here?
Seasonal views of the Earth
Constellations Lab tomorrow.
Pencil
Eraser
Ruler