358
SYNOPTICAL TABLES.
Magnitude of the smallest stars visible, | 7th |
Magnitude of the |
16th |
Light of a star of the 6th magnitude (1st magnitude = 1), | 1-1OOth |
Number of stars of 1st magnitude, | 24 |
Number of stars of 1st magnitude, |
50-60 |
Number of stars of 1st magnitude, |
200 |
Number of stars |
15,000 |
Number of stars |
5,500,000 |
Rate at which light travels per second, in miles, | 200,000 |
Time required by light to traverse the distance of a star with one second of parallax, in years, | 3y. 83d. |
Corresponding distance in billions of miles, | 20 |
Distance of smallest stars seen in telescopes of 75 space penetrating power, measured by light in years, | 2,000 |
Star 61 Cygni, parallax first detected in it, by Bessel, | 0″.349 |
Star 61 Cygni, |
5″ |
Star 61 Cygni, |
15″ |
Star 61 Cygni, |
0.353 |
α Centauri, parallax, | 0″.9128 |
α Centauri, |
3.5 |
α Centauri, |
4″ |
Number of stars to which parallax has been assigned, | 9 |
Probable average distance of stars of 1st magnitude, measured by light, in years, | 15.5 |
Probable average distance of stars of |
28 |
Probable average distance of stars of |
43 |
Probable average distance of stars of |
60 |
Probable average distance of stars of |
84 |