This, and the inclination of the orbit being given, we have all the geometrical data necessary to compute the coordinates of the planet itself.
They not only indicate the height of the land, but also enable us to compute the declivity of the mountain slopes; and if minor features of ground lying between two contours - such as ravines, as also rocky precipices and glaciers - are indicated, as is done on the Siegfried atlas of Switzerland, they fully meet the requirements of the scientific man, the engineer and the mountain-climber.
To cover the special risks of mining, capital should earn a higher interest than in ordinary business, and if we assume that the sinking-fund be safely invested, we must compute the amortization on a lower basis than 5%.
Mathematically we have thus in all cases to compute present value on the basis of a deferred as well as a limited annuity.
When the length of a meteor's: course is known and the duration of its flight has been correctly estimated it is easy to compute the velocity in miles.