Excerpt from Tables of Calculated Hour-Angles and Altitude Azimuth Table 30 N. To 30 S: Ex-Meridian Tables 60 N. To 60 S. And Calculated Reductions Ans Azimuths of Bright Stars From 1 Hour to 3 Hours From Meridian The main purpose of these tables is to make as easy as possible the problem of finding the ship's position from combined altitudes of sun, moon, or stars, and especially to encourage the at present much neglected and apparently little valued practice of determining the Ship's position from two or three stars at twilight, a few minutes before sunrise, and a few minutes after sunset. The writer, having made a regular practice of such observations for several years of his sea life, is fully alive to the great value of the problem, and considers it to be the most valuable problem in navigation, and has consequently for the last thirty and odd years deplored the neglect of the authorities to give it in the Board of Trade examination for masters and mates. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.