"The Moon, moving like a cloud in a lower sphere, overtakes the Sun [and obscures its shining disk by its own dark body] hence it arises that the western side of the Sun’s disk is first obscured, and that the eastern side is the last part relieved from the Moon’s dark body: and to some places the Sun is eclipsed and to others is not eclipsed (although he is above the horizon) on account of their different orbits. (1)At the change of the Moon it often so happens that an observer placed at the center of the earth, would find the sun when far from the zenith, obscured by the intervening body of the moon, whilst another observer on the surface of the earth will not at the same time find him to be so obscured, as the moon will appear to him [on the higher elevation] to be depressed from the line of vision extending from his eye to the sun. Hence arises the necessity for the correction of parallax in celestial longitude and parallax in latitude in solar eclipses in consequence of the difference of the distances of the sun and the moon. (2) When the sun and moon are in opposition, the earth’s shadow envelopes the moon in darkness. As the moon is actually enveloped in darkness, and as the earth’s shadow and the moon which enters it, are at the same distance from the earth, there is therefore no call for the correction of the parallax in a lunar eclipse. (3)"