The Transit of Venus, Its Meaning and Use

able accuracy actual height angles apparent height ascer ascertain the distance astronomers band base line breadth centre circle parallel circular circumference clearly the Sun comparing course cross the Sun degrees DIAGRAM difference in length distance of Venus divided into 360 Earth than half Earth's orbit eclipse enable exact length exactly explain face fact nearly fixed fore happens horizontally inaccessible object inference less line drawn looks marked means measure meeting lines miles in diameter miles wide Moon MUSEUM nearer the Earth North point noted observer saw obvious occurred orbit of Venus particular positions passing pivot planet to cross pole possibly be equal precisely proportion purpose readers river round the Sun saw it cross scale seen simple South stations Sun's disc supposed tain tape theodolite touch the top transit of Venus tree turn his telescope twentieth width words yards