What is the imaginary angle between the periapsis point and the imagined position of an object for the same elapsed time called?

Correct Answer : Option (A) :   Barker’s equation

Explanation : Barker’s equation is used to determine the time of flight from periapsis to a position on the parabolic trajectory at a true anomaly of θ.

Correct Answer : Option (C) :   Mean anomaly

Explanation : The mean anomaly is an angle an imaginary satellite would have if it were in a circular orbit around the center point O with a time period T equal to the true satellite orbit.

Correct Answer : Option (D) :   Eccentric anomaly

Explanation : Eccentric anomaly is the angle that is formed by drawing an auxiliary circle of an ellipse with center O and focus F. A perpendicular line is drawn to the semimajor axis intersecting at A. The angle E thus formed is the eccentric anomaly. It is used to obtain the position of the body in the orbit.