Harmonic Constant Data Format
# -- Order in which NOS lists the constituents. 
Name -- Common name used to refer to a paticular constituent, subscript refers to the number of cycles per day. 
Ampl -- One-half the range of a tidal constituent. 
Epoch -- The phase lag of the observed tidal constituent relative to the theoretical equilibrium tide. 
Speed -- The rate change in the phase of a constituent, expressed in degrees per hour. The speed is equal to 360 degrees divided by the constituent period expressed in hours. 

Harmonic Constant Names
M2 - Principal lunar semidiurnal constituent 
S2 - Principal solar semidiurnal constituent 
N2 - Larger lunar elliptic semidiurnal constituent 
K1 - Lunar diurnal constituent 
M4 - Shallow water overtides of principal lunar constituent 
O1 - Lunar diurnal constituent 
M6 - Shallow water overtides of principal lunar constituent 
MK3 - Shallow water terdiurnal 
S4 - Shallow water overtides of principal solar constituent 
MN4 - Shallow water quarter diurnal constituent 
NU2 - Larger lunar evectional constituent 
S6 - Shallow water overtides of principal solar constituent 
MU2 - Variational constituent 
2N2 - Lunar elliptical semidiurnal second-order constituent 
OO1 - Lunar diurnal LAM2 - Smaller lunar evectional constituent 
S1 - Solar diurnal constituent 
M1 - Smaller lunar elliptic diurnal constituent 
J1 - Smaller lunar elliptic diurnal constituent 
MM - Lunar monthly constituent 
SSA - Solar semiannual constituent 
SA - Solar annual constituent 
MSF - Lunisolar synodic fortnightly constituent 
MF - Lunisolar fortnightly constituent 
RHO - Larger lunar evectional diurnal constituent 
Q1 - Larger lunar elliptic diurnal constituent 
T2 - Larger solar elliptic constituent 
R2 - Smaller solar elliptic constituent 
2Q1 - Larger elliptic diurnal 
P1 - Solar diurnal constituent 
2SM2 - Shallow water semidiurnal constituent 
M3 - Lunar terdiurnal constituent 
L2 - Smaller lunar elliptic semidiurnal constituent 
2MK3 - Shallow water terdiurnal constituent 
K2 - Lunisolar semidiurnal constituent 
M8 - Shallow water eighth diurnal constituent 
MS4 - Shallow water quarter diurnal constituent