The earth's orbit passes through the perihelion of its orbit. As a result, the earth ends up closest to the sun in its orbit. This occurs in the winter, usually between January 1st through 4th.
a comet
vent a+
FLAT
There is no 'periodic' change in the earths orbit. The orbit is elliptical and over time (a great many years) becomes less so.
There is no seismic wave that can only pass through the Earth's mantle. However S-waves can not travel through earth's outer core because it is a liquid.
Most of them, as the Earth's inner core is equivalent to that of the sun.
the earths orbit because the earths orbit is the size of earth + the size of the moon
The earth's orbit passes through the orbits of cometary debris which manifest themselves as meteorite showers.
Earths Orbit? Earths Orbit?
vent a+
vent a+
vent a+
Earths orbit around the sun is not unusual.
The ozone layer.
it sucks
earths tempertures
Venus
earths tempertures