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Apparent Movement of the Stars through the Night and Differe

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Jenmarielle Lingat

on 8 December 2015

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Transcript of Apparent Movement of the Stars through the Night and Differe

Apparent Movement of the Stars through the Night and Different Star Patterns through the Year
- By observing Sun's movement and position in the sky, we can tell what time of the day it is.
Location: Ogden, Utah
(These shots are called star trails)
- Stars move from east (right) to west (left) as the night deepens.
Why do the stars move across the sky?
- a mechanical model to explain the motions of the sky.
Celestial Sphere
Can we all see the same stars?
- Because Earth is round and just rotates on its north-south axis, we only see the stars above the Hemisphere in which we live. Earth seems to be in the middle of a great dark ball, the celestial sphere.
This several-hour-long time exposure shows the clockwise motion of the southern stars.
Polaris (North Star)
-brightest star in the constellation Ursa Minor (Little Dipper)
-situated slightly less than 1 degree from the North Pole.
-As the stars move through the sky, they stay in the same patterns. That is, the apparent "distance" between any 2 stars never changes.
10 minutes = 2.5 degrees
20 minutes = 5 degrees
30 minutes = 7.5 degrees
1 hour = 15 degree
24 hour day = 360 degrees
-The stars therefore complete a full circle (360 degrees) in 24 hours.
-The rotation of the Earth on its axis causes the apparent nightly movement of the stars across the sky.
Additional infos.
In fact, it takes a little less than an hour for the stars to move by 15 degrees, and therefore it takes a little less than 24 hours for the stars to complete an entire circle. In fact, it takes just 23 hours and 56 minutes.
So, as the seasons pass, we see different groups of stars in a given direction, at any given time of night.
The revolution is responsible for the fact that we can see different parts of the sky at different parts of the year.
-Just like the sun, stars also seem to move from east to west.
Why do the stars move across the sky?
Full transcript