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. I. The Measurement of Angles - We assume that the pupil, before he begins to learn astronomy, knows at least as much geometry as is contained in the first three books of Euclid. It will also be greatly to his advantage to have some acquaintance with trigonometry but this will not be indispensable for the reading of this volume, which is only an intro duction to the science.