Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 229
erefore of the utmost importance in as-tronomical researches. What is the mass of Venus ? What her density 1 What nppearances have led astrono-mers to suspect that this planet is possessed of an atmosphere 7 What is said in regard tothe transits of Venus ? TRANSIT OF VENUS. 215 conduct to the… … sit takes place, HVI a portion of the orbit of Yenus,and FG, a diameter of the earth perpendicular to theecliptic. If at the time of the transit two spectatorswere respectively placed at F and G-, the diameter ofDhe earth apart, the observer at F would see Yenusin the direction FY, projected as a…
Astronomy
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-109-31.webp)
