1. More Evidence of The Earth’s Motion

2. Two Kinds of Evidence: Ecliptic Seasons Solstices Equinoxes
1. Supports Either Earth OR Sun Moving
2. Only supports Heliocentric Theory
Ecliptic
Seasons
Solstices
Equinoxes
Stellar Parallax
Meteors

3. Evidence for Earth OR Sun Moving:
The Ecliptic
The apparent path of the sun among the stars
Like walking around a campfire – the background changes behind it

5. Evidence for Earth OR Sun Moving:
Seasons
The tilt of the earth’s axis (23.5 degrees) and its revolution around the sun cause the longer days and the change in the sun’s position in the sky
The north end of the axis always points to the North Star
In summer, the North Pole tilts toward the sun

6. Northern Hemisphere Summer
Northern Hemisphere Winter

7. Summer Solstice
June 21 in the Northern Hemisphere: Sun appears Highest in the sky.
Winter Solstice
December 21 in the Northern Hemisphere: Sun appears Lowest in the sky.

8. Equinoxes: Vernal and Autumnal; number of daylight and nighttime hours are equal.

9. Evidence for Heliocentric Theory
Parallax
The apparent shift of nearby stars among farther stars as the earth’s position around the sun changes
Observed by powerful telescopes
Stars appear to move back and forth once a year

10. Evidence for Heliocentric Theory
Meteors = Small rocks/metal traveling through space
They are generally brighter and more plentiful after midnight.
After midnight, the observer is on the “leading side” of earth.
Meteors bombard the leading face more frequently.