How may the Earth's position in space be related to the cycle of extinctions on earth
No, the position of the Moon and the Sun as OBSERVED from the Earth.
The earth's position has no affect on constellations' visibility. The position of the viewer on the surface of the earth will affect what constellations are visible.
3rd
it depend on you position on earth
There is no way of knowing when or even if the Earth returns to the same absolute position, but if you mark Earth's position relative to the Sun's position, then it takes 365.25636 days, roughly equal to 365 1/4 days.
it is in one position
3rd
Earth is the third planet from the sun, after Mercury and Venus.
Astronomy
explain earth's position in the solar system and describe its closest neighbors.
Explosives would hardly be able to alter the position of earth. The only explosion that came close to altering the earth's position was from an asteroid that created 100 million mega tons of explosives.