Newcomb, Simon, 1835-1909 · New York, Harper & brothers · leaf 188
e the fine divisions on the circle. Being thus limited in its movements, an object can be seen with the telescope only when on, or very near, the meridian. The sole use of the instrument is to observe the exact times at which stars cross the meridian, and their altitudes above the horizon, or… … Fig. 46.— Spider lines in field of view of er precision and certainty to his - a meridian circle.
Astronomy
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
