Astronomy

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The sale of 3000 copies Of this book in little more than a year, many of them to persons Of more educa~ tion than I originally contemplated, has induced me to enlarge it considerably, going rather deeper into the subject, and adding some explanations which I did not venture on before. The additions chiefly relate to meteors, nebulae, and stars, the moon's acceleration and other disturbances, the tides, and the calculations for Easter in all ages; and a fuller account Of the meth ods of weighing the sun, moon, and planets. The chap ter on telescopes also has been greatly enlarged; for astronomy lives by them, and I do not know where a popular explanation Of the theory Of telescopes is to be found.