where will stars form circles due to diurnal motion??

Question

stars near polaris, the moon, the sun, or orion.

i said near orion. hopefully thats right

Answer 1

All star trails will form circles around the sky due to the rotation of the Earth...just that the full circle of many of them are blocked by the horizon.

Answer 2

The entire sky appears to turn around the poles (because the earth spins around an axis, and that axis, when projected onto the sky, gives the position of the poles).

All stars show circles due to diurnal motion, but most of the circles are interrupted by the horizon (the stars rise and set).

Stars that are close enough to the pole do not cross the horizon so they could stay visible 24 hours a day (if they did not get washed out by the light of the Sun).

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Such a star is called "circumpolar" (circles the pole).

If the declination of the star is bigger than 90˚ - LAT where LAT is your latitude, then it is circumpolar.

Is Vega circumpolar?
Vega's declination is 38.8˚N.
If you live in Southern Texas, at latitude 27˚N, then 90-27=63 and Vega's declination is not sufficient. It will rise and set.

If you live in Skagway, Alaska, let us say around latitude 59.5˚ N, then 90-59.5=30.5 and Vega will be circumpolar, because its declination is greater than 30.5˚.

Answer 3

The answer to your homework question is Polaris.

Polaris (also known as the North Star) Is straight up from the north pole on earth, since the north pole is 1 end of the Earth's axis.

its like looking straight up at your ceiling, and spinning in a circle. The point directly above you doesnt move, it just spins, while the rest of the room appears to circle around that central point.

Answer 4

Some of the planets in our solar system appear to move in a circle at times because the earth is rotating around the sun faster than they are. So we catch up to them and pass them which makes it appear that they are reversing direction or have "retrograde motion".

http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html