Posted in enart.xn--gmq282eogn.com on the March 14, 2010
i have a question that my dad asked me.
if you consider that the earth rotates about the sun, and that 'night
time' is always on the face of the earth that points away from the
sun, why is it that the field of stars we see doesnt change from
winter to summer, as the earth moves around the sun?qed100 has it right. The stars do change with the seasons, there are
just some that we can always see.
This page has a very good explanation of this.
http://www.nrc-cnrc.gc.ca/education/skies/cs-motions_e.html
"The Earth's annual orbit around the Sun, one Earth year or 365
days, results in dramatic changes in the stars visible from any one
point on the planet. As the position of the Earth changes with the
seasons, different constellations come into view. For example, Orion
is not visible from May through July, but the circumpolar Big Dipper
is visible year round although its position changes in the sky."
Also check out the link on the page to the Planisphere:
http://www.nrc-cnrc.gc.ca/education/skies/cs-planisphere_e.html
With it you can determine what stars you can see at a given time of
the year and night.
Here is a downloadable, pc based Planisphere.
http://nio.astronomy.cz/om/
If you require any additional information please let me know by
posting a request for clarification.
Thanks and have fun enjoying the stars!#If you have any other info about this subject , Please add it free.# |
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