HARMONIC ANALYSIS AND PREDICTION OF TIDES 313 
SO,, SO; Tidal constituents. 
Ssa ‘Tidal constituent. 
s Mean longitude of moon: also rate of change in same. 
Sy True longitude of moon in orbit referred to equinox (par. 59). 
a (1) Number of Julian centuries reckoned from Greenwich mean noon, 
December 31, 1899. 
(2) Hour angle of mean sun. 
(3) Time expressed in degrees of constituent reckoned from phase zero of 
Greenwich argument (par. 439). 
T> Tidal constituent. 
t (1) Hour angle of tide-producing body. 
(2) Time reckoned from beginning of tidal series. 
U Basie factor (M/E) (a/c)8. 
U; ‘Factor (S/E) (a/e)3. 
u Part of constituent argument depending upon variations in obliquity of 
lunar orbit (par. 71). 
V (1) Principal portion of constituent argument (par. 71). 
(2) Velocity of current (par. 330). 
(V+u) Constituent argument at any time. 
(V.+u) Constituent argument at beginning of a tidal series. 
Ve Potential due to gravity at earth’s surface (par. 96). 
V3 Tide-producing potential involving cube of moon’s parallax (par. 94). 
Vi Tide-producing potential involving 4th power of moon’s parallax (par. 94.) 
Longitude of observer reckoned in celestial equator from lunar inter- 
section. 
Ww Latitude of observer. When combined with a subscript consisting of a 
letter and numerals, it represents the latitude factor to be used with 
the tidal force component similarly marked (par. 79). 
zZ Geocentric zenith distance of tide-producing body. 
a (Alpha) General symbol for the initial phase of tidal constituent A. 
B (Beta) Initial phase of constituent B. 
y (Gamma) Initial phase of constituent C. 
5 (Delta) Initial phase of constituent D. 
e (Epsilon) Initial phase of constituent E. 
¢ (Zeta) The explement of the initial phase of a constituent (par. 221). 
6, (Theta) ‘Tidal constituent, same as \Q). 
« (Kappa) Local phase lag or epoch of tidal constituent (par. 144). 
x! Modified epoch of tidal constituent (par. 225). 
d» (Lambda) Tidal constituent. 
uw (Mu) Attraction of gravitation between unit masses at unit distance. 
Be Tidal constituent, same as 2MS8p. 
v (Nu) Right ascension of lunar intersection (par. 24). 
py! Term in argument of lunisolar constituent K; (par. 133). 
Qe Term in argument of lunisolar constituent Ke (par. 135). 
V2 Tidal constituent. 
— (X72) Longitude in moon’s orbit of lunar intersection (par. 24). 
m (P2) An angle of 3.14159 radians or 180°. 
Ty Tidal constituent, same as TK. 
pi (Rho) Tidal constituent, same as vK,. 
o, (Sigma) ‘Tidal constituent, same as vJ}. 
rt (Tau) Length of series in mean solar hours (par. 248). 
¢ (Phi) Tidal constituent, same as KP). 
x1 (Ch?) Tidal constituent, same as LP;. 
vy, (Ps?) Tidal constituent, same as RP). 
w (Omega) Obliquity of ecliptic. 
aq Vernal equinox. 
8% Moon’s ascending node. 
