Earth is slightly pear shaped.

This has no significant effects other than the orbits of satellites. It
doesn't cause any daily or seasonal changes which affect life on earth.

Earth wobbles on it's axis.

One wobble takes 26-thousand years. This too has no effect on the
seasons or climate. It just changes the direction that the earth's axis
points towards in space.

Earth is gradually slowing down, that is why we sometimes add one second
to the lenght of the year.

This is caused by the tidal (gravitational) interaction of the earth and
moon. The earth's rotation is slowing down and the moon is moving
farther away from the earth in it's orbit.

The solar system which Earth is in which is also in the Milky Way Galaxie
is moving through Space at about 60,000 miles per hour.

It's all relative. The earth is moving (rotating) at 1000-miles per hour
at the equator. The earth revolves at about 66,000-mph in it's orbit
around the sun. The solar system is revolving around the center of the
galaxy at about 550,000-mph. Our Milky Way galaxy is moving through
space at millions of miles per hour relative to most other galaxies but
we are actually approaching the Andromeda galaxy, which is currently
about 2-million light years away. (11,600,000-trillion miles) It will
still take about 3-billion years before the big collison.

http://tinyurl.com/2zlp44

Earth is closer to the Sun in Winter and further away from the Sun
in Summer.

This is true only for the northern hemisphere and it's not what causes
the seasons.

HFguy wrote:

Earth is closer to the Sun in Winter and further away from the Sun
in Summer.

This is true only for the northern hemisphere and it's not what causes
the seasons.


The tilt of the axis causes seasons, but your distance theories are out
to lunch.

============================================
The difference between the distances on 4 January and 4 July is about 3
percent, which corresponds to about 5 million km or 3 million mi.

http://www.astro.uu.nl/~strous/AA/en...en/zon.html#11
=============================================




mike

"HFguy" wrote in message
news:uv1hi.10571$9b5.1632@trndny05...
Earth is closer to the Sun in Winter and further away from the Sun
in Summer.

This is true only for the northern hemisphere and it's not what causes the
seasons.


The Earth reaches perihelion - the point in its orbit closest to the Sun -
in early January, only about two weeks after the December solstice. Thus
winter begins in the northern hemisphere at about the time that the Earth is
nearest the Sun. Is this important? Is there a reason why the times of
solstice and perihelion are so close? It turns out that the proximity of the
two dates is a coincidence of the particular century we live in. The date of
perihelion does not remain fixed, but, over very long periods of time,
slowly regresses (moves later) within the year. There is some evidence that
this long-term change in the date of perihelion influences the Earth's
climate.

"Brenda Ann" wrote in message
news

"HFguy" wrote in message
news:uv1hi.10571$9b5.1632@trndny05...
Earth is closer to the Sun in Winter and further away from the Sun
in Summer.

This is true only for the northern hemisphere and it's not what causes
the seasons.


The Earth reaches perihelion - the point in its orbit closest to the Sun -
in early January, only about two weeks after the December solstice. Thus
winter begins in the northern hemisphere at about the time that the Earth
is nearest the Sun. Is this important? Is there a reason why the times of
solstice and perihelion are so close? It turns out that the proximity of
the two dates is a coincidence of the particular century we live in. The
date of perihelion does not remain fixed, but, over very long periods of
time, slowly regresses (moves later) within the year. There is some
evidence that this long-term change in the date of perihelion influences
the Earth's climate.



My bad, forgot the link/cite:

http://aa.usno.navy.mil/faq/docs/seasons_orbit.html