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...the equinoxes. Since it changes the direction of the Earth's tilt, and the Earth's tilt is what causes the seasons, the seasonal constellations change a tiny

...another 5 billion years it will become a red giant and swell as far as the Earth's orbit or further. They come in all varieties, and are typically two-lobed because of rotation of the parent star. They appear round only when seen from one end.

...from these images that the views we have of Mars change quickly due to the rotation of the planet, its distance from us, and the quality of the telescope. Rema ...its axis is tipped 25.2 degrees to the plane of its orbit (even more than Earth's 23.5 degrees). The polar caps increase and decrease in size with the season

...nother. Their changing position in the sky is a consequence of the Earth's rotation. If we watch year after year we can actually see the nearest ones move. The Suppose, for example, a star 1 parsec away moved through space 10x the Earth's distance to the Sun, that is, 10 astronomical units. To us it would seem to

== Rotation of the Sun == Let's look for rotation in some very good images from Mees taken in 1998 when the Sun was very acti

...form or structure, watching craters or shadows on the Moon, following the rotation of Saturn, Jupiter or Mars, or looking for the colors of stars. The color i ...in better detail by selecting the very best images that are not blurred by Earth's atmosphere. Our wide field telescopes show faint nebulae and star clusters

...n the mirror over the vertical light path. This mirror is parallel to the Earth's axis, and is on wheels that allow it to move north-south during the year. ...er of the field. If they do not have the motors running, then the Earth's rotation causes the image to drift quickly out of view. However, the sidereal motio

== Discover the Rotation of the Earth == demonstrated the rotation of the Earth. Inside the dome of the Pantheon of Paris, Foucault suspended

Nearly fours hours later, at UT 03:45, Jupiter is visible as the Earth's rotation carries us around to bring it into view at the upper right. Those are

not a static map, but a dynamic moving picture of the sky as the Earth's rotation brings an *How Earth's place in space alters the appearance of planets and comets