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Question 1 (a) Sketch the celestial sphere depicting the Equatorial coordinate system showing the position and...

Question 1

(a) Sketch the celestial sphere depicting the Equatorial coordinate system showing the position and apparent motion of an example star ‘X’. Indicate on the sketch the (i) fundamental plane, (ii) the poles, (iii) the origin of the system, and (iv) the coordinates right ascension and declination of the system of the star ‘X’

(b) How is the Hour Angle used to help plan observations during the night at a telescope?

(c) Declination and Right Ascension are essentially fixed for most objects. List the two exceptions to this statement.

Solutions

Expert Solution

a.

c. The RA and declination remain fixed for most oblects but it may change slowly over a period of time due to a phenomenon called precession ,this process occurs because both ecliptic and equator are slowly moving as a result of sun ,moon and other planets.

The point where where ecliptic crosses the equitorila plane of the celestial sphere are equinoxes.On equinox,celestial equator and ecliptic intersect,these points of intersection are equinoctical point RA = 00h 00m 00s and autuminal point RA = 12h 00m 00s.

Amanda K answered 10 months ago
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