Whence the equation for α Columbæ is
51·1 − 0·896 dφ + 0·404 dT − h0 = 0 (2)
ε Canis majoris.
| Watch time | 4h 24m 35s·8 | |
| Watch fast | 2 22 ·0 | |
| 4 22 13 ·8 | ||
| Star’s R.A. | 6 54 57 ·1 | |
| t | 2 32 43 ·3 | = 38° 10′ 49″·5 E. of meridian. |
| φ = 24° 20′ 50″ | log sin | 1·6151769 | |||
| δ = 28° 50′ 52″·7 | log sin | 1·6834857 | |||
| 1·2986626 | |||||
| Nat. (1) | 0·1989128 | ||||
| φ = 24° 20′ 50″ | log cos | 1·9595488 | |||
| δ = 28° 50′ 52″·7 | log cos | 1·9424561 | log cos δ | 1·9424 | |
| t = 38° 10′ 49″·5 | log cos | 1·8954602 | log sin t | 1·7911 | |
| 1·7974651 | 1·7335 | ||||
| Nat. (2) | 0·6272853 | log cos h | 1·9560 | ||
| Nat. (1) | 0·1989128 | log sin A | 1·7775 | ||
| 0·4283725 | log cos φ | 1·9595 | |||
| log sin h | 1·6318215 | 1·7370 | |||
| Nat. = | 0·546 | ||||
| h | = | 25° 21′ 51″·5 | |||
| log cos A | 1·9034 | ||||
| Nat. = | 0·801 |
Whence the equation for ε Canis majoris is
51·5 − 0·801 dφ + 0·546 dT − h0 = 0 (3)
Collecting the equations of the three stars, we have
35·8 + 1·000 dφ − 0·011 dT − h0 = 0 (1)
51·1 − 0·896 dφ + 0·404 dT − h0 = 0 (2)