DECIMAL CLASSIFICATION 
526.9 
91 
.92 
93 
94 
95 
96 
97 
98 
99 
227 
> 
328 
RB 
2 
8 
9 
520 
A 
7 
71 
72 
73 
74 
75 
76 
77 
»Q 
Surveying 
Instruments and methods 
Mesurement of distances 
Mesurement of angles 
Mesurement of hights 
Leveling See 526.36-.38 
Plotting 
Computation of areas 
Topografic drawing 
For special purposes: military, naval, railroad, mining, ete. 
Javigation Nautic astronomy 
Finding latitude at sea  Seealso 525.41 
Finding longitude at sea See also 525.46 
Finding time at sea See also 520.74 
Sumner’s method 
Great circle sailing 
Ephemerides Nautic almanacs 
American 
English 
German 
French 
Italian 
Spanish 
Slavic 
Scandinavian 
Construction of ephemeris 
“hronology 
Sidereal and solar day 
Apparent and mean time, equation of time, causes of inequality 
Solar year, months 
Kalendars; including early and Oriental 
Kalendar of Julius Caesar 
Kalendar of Gregory, 1582— Almanacs 
Ecclesiastic kalendar: determination 
For feasts, etc. and kalendars themselvs, see 264.021, 264.031, etc, 
Horology 
Finding time by transit 
Finding by equal altitudes 
Finding by single altitude 
Finding by sextant See also 527.3 
Time systems, and standards 
Distribution of time 
Cosmic time 
Instruments for mesuring: dials, hourglasses, clocks, 
watches, etc. 
See 522.51 for Sidereal clocks and chronometers 
Qea 621 11 for Clock and watch making