because the stars move around and we cant see it staright
because of earths rotation
The period of a planet's revolution is the time that it takes to complete one revolution around its axis of rotation relative to the background stars (also known as rotation period).
There are two major motions affecting the Earth: its rotation around its axis, and its rotation around the Sun (which we call 'revolution'). While the rotation of the Earth on its axis causes the nightly movement of the stars across the sky, the revolution is responsible for the fact that we can see different parts of the sky at different parts of the year.
Rotation is the one we REALLY notice; this causes days and nights. (Of course, for thousands of years people thought it was the sky that rotated around the Earth.) Also, rotation causes the tides to move around the Earth. Rotation also affects wind directions. The Earth's revolution around the Sun takes a year. Because the Earth's axis is tilted that gives us the seasons. Also, we see different stars at night at different times of year, as the position of the Sun changes in the sky.
1) The earths orbit 2) the stars also have an orbit
stars seams to rotate around the northern star
because of earths rotation
the earths rotation
Due to the vast distance between the earth and polaris, the earths axis of rotation essentially lines up with polaris at all times, so when the stars are visible, and viewed from the north pole, the earths rotation causes the stars to appear to rotate around polaris.
The period of a planet's revolution is the time that it takes to complete one revolution around its axis of rotation relative to the background stars (also known as rotation period).
Planets and stars, aside from our sun, do not affect our weather.
The period of rotation for each of the planets is as follows - the sidereal rotation (rotation time against background stars); PlanetSidereal rotational periodMercury58.646225Venus-243.0187Earth0.99726957Mars1.02595675Jupiter0.41007Saturn0.426Uranus-0.71833Neptune0.67125
There are two major motions affecting the Earth: its rotation around its axis, and its rotation around the Sun (which we call 'revolution'). While the rotation of the Earth on its axis causes the nightly movement of the stars across the sky, the revolution is responsible for the fact that we can see different parts of the sky at different parts of the year.
Earth blocks half of space from our view.
The sidereal rotation period of Mars - one spin on its axis relative to background stars, is 24.623 hours. This is very similar to the earths sidereal rotation period.
according to big bang theory all heavenly bodies originated from single primeval atom, after it broke into several fragments and pieces, its whole energy was spread in frictionless universe. As a result all stars and planets formed
The passage of the sun across the sky during daylight, and the stars circling round the axis during darkness.