GK
WORLD GEOGRAPHY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
degrees
|
|
|
time-hours, minutes and seconds
|
|
|
only hours
|
|
|
only seconds
|
Detailed explanation-1: -Right ascension (RA) is the celestial equivalent of longitude. RA can be expressed in degrees, but it is more common to specify it in hours, minutes, and seconds of time: the sky appears to turn 360° in 24 hours, or 15° in one hour. So an hour of RA equals 15° of sky rotation.
Detailed explanation-2: -The total range of right ascension is 24 hrs = 360 deg / 15 deg/hr. The 15 deg/hr conversion factor arises from the rotation rate of the Earth. Declination is analogous to latitude and is measured as north or south of the celestial equator.
Detailed explanation-3: -Declination (green) is measured in degrees north and south of the celestial equator. Right ascension, akin to longitude, is measured east from the equinox. The red circle is the Sun’s apparent path around the sky, which defines the ecliptic.