Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 137
ect of Part Second ? What of Chapter I. ? What is said of thesun ? What form does it present when viewed through colored lasses 1 What is itsaverage angular diameter ? Is it flat and round like a plate 1 What proof have we thatit is a globe ? What two quantities must be known in order to ascertain… … 231. We next take them from the trigonometrical tables the values of the sides of a triangle similar to SEB. Let SlElBl Fig. 44, be such a triangle, in which the angle SlElBl equal to SEB is 16; SlBlEl equal to SBE is a right angle, and B^E1 equal to BSE is 89° 44/.8 Now if SE1 is one mile, the…
Astronomy
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