Question

part (c) now rotate the view until you are facing south (s). again, advance the time forward in minute steps. which of the following statements accurately describes how a star’s right ascension and declination change in your view looking toward the southern horizon as they cross (\transit\) the meridian?
options:

• right ascension and declination remain constant
• right ascension decreases, declination increases
• right ascension increases, declination decreases
• right ascension increases, declination increases
• right ascension decreases, declination decreases

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Explanation:

Right ascension (RA) and declination (Dec) are intrinsic celestial coordinates of a star, meaning they are fixed properties of the star and do not change as the observer rotates or moves time forward (since these coordinates are defined relative to the celestial sphere, not the observer's local horizon or time - unless considering very long - term celestial motions like proper motion, which is negligible over short time steps here). So as a star transits the meridian while the observer rotates to face south and advances time in minute steps, the star's right ascension and declination remain constant.

Answer:

Right ascension and declination remain constant