| Author: | George C. Comstock | ISBN: | 1230002097428 |
| Publisher: | Gbooks | Publication: | January 16, 2018 |
| Imprint: | Language: | English |
| Author: | George C. Comstock |
| ISBN: | 1230002097428 |
| Publisher: | Gbooks |
| Publication: | January 16, 2018 |
| Imprint: | |
| Language: | English |
4. The horizon—altitudes.—In their observations astronomers and sailors make much use of the plane of the horizon, and practically any flat and level surface, such as that of a smooth pond, may be regarded as a part of this plane and used as such. A very common observation relating to the plane of the horizon is called "taking the sun's altitude," and consists in measuring the angle between the sun's rays and the plane of the horizon upon which they fall.
4. The horizon—altitudes.—In their observations astronomers and sailors make much use of the plane of the horizon, and practically any flat and level surface, such as that of a smooth pond, may be regarded as a part of this plane and used as such. A very common observation relating to the plane of the horizon is called "taking the sun's altitude," and consists in measuring the angle between the sun's rays and the plane of the horizon upon which they fall.
