Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 38
s greater thanA A, or 2^^ times greater than the diameter of the earth,as seen from the sun, or Jive times greater than the sunshorizontal parallax; it is therefore but one fifth part asdifficult to measure the angle BAB^ as to measure theangle A B^ A. There is another important advantage gained… … If we note, then, exactly the moment the planet is incontact with the solar disk at p, and also at p, this inter-val of time will give an enlarged measure of the chord pp,described by the planet as seen from the station A. Inlike manner the observer at A making the same observa- 36 THE SUN.…
Astronomy
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