In a recent issue of the Proceedings, I outlined a method for computing the altitude from the dead-reckoning position using Martelli's tables. Those using these tables know that this was an important addition. No one has found additional uses for these tables until now, although the tables have been in use for many years, in fact the examples given in the 1932 edition are for the year 1888. 4No attempt will be made to compare these tables with any of the new methods, except, in a general way, to show their simplicity and accuracy for computing the altitude, time and altitude azimuth, amplitude, great circle course and distance, identifying unknown stars, and finding the local hour angle.
Table I of the present edition extends only to 71°-34', but I have extended this table to 89°-55'. No other changes in table construction have been made. An example in the different uses will readily show the simplicity and accuracy of this method
Time and altitude azimuth.—Take the example for computing the altitude of the sun as a sample problem. Convert hour angle to arc, either sun or star.