Example:

March 15th, 1919. CT 10h -- 4m -- 32s. D.R. latitude 40 deg. 10' N,
longitude 74 deg. W. Find the TZ.

G.M.T. 10h--04m--32s
Eq. T. --09 --10

G.A.T. 9h--55m--22s

G.A.T. 9h--55m--22s
Lo. in T. 4 --56 --00 (W--)

L.A.T. 4h--59m--22s
Latitude and Declination opp. name.
TZ = N 101 deg. 30'W

We will take up later a further use of azimuths to find the error of
your compass. Right now all you have to keep in mind is what an azimuth
is and how you apply the formulas already given you to get the
information necessary to enter the Azimuth Tables for the sun's true
bearing at any time of the astronomical day when the sun can be seen. In
consulting these tables it must be remembered that if your L.A.T. or
S.H.A. is, astronomically, 20h (A.M.), you must subtract 12 hours in
order to bring the time within the scope of these tables which are
arranged from apparent six o'clock A.M. to noon and from apparent noon
to 6 P.M. respectively.

We are taking up sun azimuths today in order to get a thorough
understanding of them before beginning a discussion of the Marc St.
Hilaire Method which we will have tomorrow. You must get clearly in your
minds just what a line of position is and how it is found. Yesterday I
tried to explain what a line of position was, i.e., a line at right
angles to the sun's or other celestial body's true bearing--in other
words, a line at right angles to the sun's or other celestial body's
azimuth. Today I tried to show you how to find your azimuth from the
azimuth tables for any hour of the day. Tomorrow we will start to use
azimuths in working out sights for lines of position by the Marc St.
Hilaire Method.

Note to Instructor: Spend the rest of the time in finding sun azimuths
in the tables by working out such examples as these:

1. April 29th, 1919. D.R. latitude 40 deg. 40' N, Longitude 74 deg. 55' 14" W.
CT 10h--14m--24s. CC 4m--30s slow. Find TZ.

2. May 15th, 1919. D.R. latitude 19 deg. 20' S, Longitude 40 deg. 15' 44" E. CT
10h--44m--55s A.M. CC 3m--10s fast. Find TZ.

Note to Instructor:

If possible, give more examples to find TZ and also some examples on
latitude by meridian altitude.

Assign for Night Work reading the following Articles in Bowditch:
371-372-373-374-375. Also, examples to find TZ.

FRIDAY LECTURE

MARC ST. HILAIRE METHOD BY A SUN SIGHT

You have learned how to get your latitude by an observation at noon. By
the M