149 million km
Astronomical unit
Flattened circular path around 2 points
Ellipse
Elliptical orbit around the sun, planets
Revolution
The movement of a figure on an axis (spinning)
Rotation
Axis is tilted 23.5 degrees, responsible for seasons
Earth's tilt
2 times per year-when the sun is directly over the equator
Equinox
2 times per year-when the sun is at its most nothern or southern point
solstice
Attraction between 2 objects
Gravity
Longest day of the year
Summer solstice
Shortest day of the year
Winter solstice
The season after winter and before summer, in which vegetation begins to appear, in the northern hemisphere from march to may and in the Southern Hemisphere from December to November
Spring
The warmest season of the year, in the northern hemisphere from June to august and in the Southern Hemisphere from December to February
Summer
The coldest season of the year, in the northern hemisphere from December to February and in the Southern Hemisphere from June to august
Winter
A curved path around a star or planet
Orbit
The third season of the year, when crops and fruits are gathered and leaves fall, in the northern hemisphere from September to November and in the Southern Hemisphere from march to may
Autumn