MHW 



MSL 



MLW- 



17 



21 



Days 



25 



Days 



MSL 





A 

 _ 3 



s 



' • 



•^^ E 



MHW 







MSL 



iiyiiiiKiiii 



MM 



fimlifll 



IMMMz 



yjj--[i- 



JX-ili 



MLW 



. 





— -* — . t 



' »..'— L*- » ■" 





1^ ' 



- 1 . 



MSL 



29 



Figure 1. Tide predictions for Boston, Massachusetts, Januar}" 1963; predicted 

 mean range 2.92 meters (9.58 feet). Note that tlie envelope of alternate 

 high and alternate low tides, wliich shows the greatest range in the first 

 part of the month, indicates the lesser range during the latter part of the 

 month. Letters and symbols above the curves are: E = Moon above 

 Equator; P=Moon in perigee; A = Moon in apogee; N = Moon farthest 

 north of Equator; S = Moon farthest soutli of Equator; © = Moon in first 

 quarter; 3 = Moon in third quarter; O = fuU Moon; • = new Moon. 



16 



