Well, solar energy can't really effect the earth but there are some impacts: it is very weather dependable, the actual manufactured of solar cells uses a lot of energy and releases toxic pollutants...
If the Earth's axis was vertical - every point on its surface would have the same length of day and night, no matter what time of year it was. The tilt of the axis (to about 11 degrees) means that, as the Earth rotates, and travels around the sun, the length of day shortens and lengthens throughout the year.
north pole
The earths tilt at its axis
south
The season
The geographical North and South Pole - not the magnetic poles.
it creates the seasons.
Earths rotation around its axis
There would be no four seasons if the earths axis was not tilted.
Unequal heating of the earth's surface. The earth's axis.
Because the Earth is spinning - at about 1000 miles per hour at the equator.
intersect
the Earth's tilted axis.
the Earth's tilted axis.
The earths rotation about its axis has no affect on the orbit of satellites about earth. Only their relative velocities and positions are relevant, not their orientation
There would be no four seasons if the earths axis was not titled.
It would receive more direct Sun in the summer.