Recreations in Astronomy / With Directions for Practical Experiments and Telescopic Work

by Henry White Warren

Pointers, the, [197].

Pole, North, movement of, [198].

Poles, the extremities of an imaginary line on which a celestial body rotates.

Quadrant, the fourth part of the circumference of a circle, or 90°.

Quadrature, a position of the moon or other body when 90° from the sun.

Radiant point, that point of the heavens from which meteors seem to diverge, [118].

Radius-vector, an imaginary line joining the sun and a planet or comet in any part of its orbit.

Rain, weight of, [249].

Reflecting telescope, [44].

Refracting telescope, [43].