QUESTION IMAGE
Question
part (c)
now rotate the view until you are facing south (s). again, advance the time forward in minute steps. which of the follow change in your view looking toward the southern horizon as they cross (\transit\) the meridian?
right ascension and declination remain constant ✔ correct!
part (d)
now rotate the view until you are facing north (n). zoom out slowly until you can see the east (e) and west (w) indicators the time forward in minute steps and identify the one (moderately bright) star that does not move. this point is the north c polaris. upon clicking the star, a box with information should appear that contains the right ascension (ra) and declination ( match the following statements that describe either right ascension or declination.
chart: right ascension and declination with descriptions
✔ correct!
part (e)
which of these statements about polaris is correct?
it is located at a declination of about +90°. ✔ correct!
part (f)
in which direction across the sky does right ascension increase?
☐ east to west ☐ radially away from earth
☐ west to east ☐ north to south
☐ south to north
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To determine the direction in which right ascension (RA) increases, we recall the celestial coordinate system. Right ascension is analogous to longitude on Earth, and it is measured in hours, minutes, and seconds eastward along the celestial equator. As the Earth rotates from west to east, the apparent motion of stars across the sky is from east to west, but the celestial coordinate of right ascension increases in the direction of the Earth's rotation (west to east) because RA is a coordinate fixed relative to the celestial sphere. So, right ascension increases from west to east.
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West to east