Question 1655Navigation General70% to pass
The GHA of the first point of Aries is 315° and the GHA of a planet is 150°. What is the right ascension of the planet?
AI Explanation
The correct answer is B) 11 hours.
To determine the right ascension of the planet, we need to use the relationship between the GHA (Greenwich Hour Angle) of the first point of Aries and the GHA of the planet. The right ascension of a celestial body is the angle measured eastward along the celestial equator from the first point of Aries to the hour circle passing through the body.
Given:
- GHA of the first point of Aries is 315°
- GHA of the planet is 150°
The right ascension of the planet is the difference between the GHA of the planet and the GHA of the first point of Aries, which is 150° - 315° = -165°. Since right ascension is measured in hours, with 1 hour corresponding to 15°, the right ascension of the planet is -165° / 15° = -11 hours.
The other options are incorrect because they do not match the calculated right ascension of the planet.
Related Questions
#1653 In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system? #1654 If the right ascension of a body is 9 hours, it also _______________.#1656 The celestial coordinate of a star that is relatively constant in value is the _______________.#1657 The path of a celestial body during its daily apparent revolution around the Earth is called its _______________.#1658 The GHA of a star _______________.