The Practical Astronomer Comprising illustrations of light and colours--practical descriptions of all kinds of telescopes--the use of the equatorial-transit--circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy

CHAPTER III.

Chapter 932 wordsPublic domain

ON THE OPTICAL ANGLE, AND THE APPARENT MAGNITUDE OF OBJECTS.

Various illustrations of the apparent magnitude of objects--Fallacies in relation to apparent magnitudes--Apparent magnitudes in the heavens--Difference between _absolute_ and apparent magnitudes

_page_ 206-213.