APPENDIX I 
PHYSICAL AND ASTRONOMICAL CONSTANTS 
Physical Constants. 
Number 
Logarithm 
H 
Mass of hydrogen atom 
1-662.10- 24 
24-2206 
m 
Mass of electron = h/ 1845 
9-01.10 - 28 
28-9546 
e 
Charge of electron in electrostatic units 
4-77.10 -. 10 
TO-6789 
b 
f x radius of electron = e 2 /mc 2 
2-81.10- 13 
Î3-4494 
u c 
, Arithmetic mean speed of electron at 1 ° abs. 
6-23.10 5 
5-7944 
c 
Velocity of light 
3-00.10 10 
10-4769 
R 
Boltzmann’s constant = ¿ 77 -mu 0 2 
1-372.10- 16 
Ï6-1374 
5R 
Gas constant = R/h 
8-26.10 7 
7-9168 
a 
Coefficient of Stefan’s law = ^77 5 R*/c 3 h 3 
7-64.10- 15 
15-8832 
h 
Planck’s constant 
6-55.10 - 27 
27-8161 
G 
Constant of gravitation 
6-66. 10- 8 
8-8235 
Loschmidt’s number (molecules per cu. cm. 
at 273°T and 10 6 dynes) 
2-67.10 19 
19-4263 
Rydberg’s constant = 2Tr 2 e i mH/ch 3 (n + m) 
109678-3 
5-0401 
A stronomical Constants. 
Number 
Logarithm 
The Sun. Mass (gm.) 
1-985.10 33 
33-2978 
Radius (cm.) 
6-951.10 10 
10-8421 
Mean density (gm./cm. 3 ) 
1-4109 
0-1495 
Gravity at surface (cm./sec. 2 ) 
2-736.10 4 
4-4371 
Total radiation (ergs/sec.) 
3-780.10 33 
33-5775 
H/c at surface (ergs/cm. 3 ) 
2-08 
0-3171 
Effective temperature (deg. abs.) 
5741 
3-7590 
Absolute bolometric magnitude 
4-85 
— 
Astronomical unit (cm.) 
1-494.10 13 
13-1744 
Parsec (cm.) 
3-08.10 18 
18-4888 
Sidereal year (sec.) 
3-156.10 7 
7-4991 
Light ratio for 1 magnitude 
2-512 
0-4000 
Miscellaneous Factors. 
Number 
Logarithm 
hc/& 2 861 
2-9352 
hc/R 1-431 
0-1556 
4t-ncG 25100 
4-3996 
177 4-189 
0-6221 
Napierian base 2-7183 
0-4343 
!