With the sentiment compare: 'And as our Alchymists can finde their whole art and worke of Alchymy, not only in Virgil and Ovid, but in Moses and Solomon; so these men can find such a transmutation into golde, such a foundation of profit, in extorting a sense for Purgatory, or other profitable Doctrines, out of any Scripture.' _Sermons_ 80. 78. 791.
'Un personnage de grande dignité, me voulant approuver par authorité cette queste de la pierre philosophale où il est tout plongé, m'allegua dernièrement cinq ou six passages de la Bible, sur lesquels il disoit s'estre premièrement fondé pour la descharge de sa conscience (car il est de profession ecclesiastique); et, à la verité, l'invention n'en estoit pas seulement plaisante, mais encore bien proprement accommodée à la défence de cette belle science.' Montaigne, _Apologie de Raimond Sebond_ (_Les Essais_, ii. 12).
PAGE =32=, ll. 59-61. _To take a latitude, &c._ The latitude of a spot may always be found by measuring the distance from the zenith of a star whose altitude, i.e. distance from the equator, is known. The words 'At their brightest' are only used to point the antithesis with the 'dark eclipses' used to measure longitude.
ll. 61-3. _but to conclude Of longitudes, what other way have wee, But to marke when, and where the dark eclipses bee_.
This method of estimating longitude was, it is said, first discovered by noting that an eclipse which took place during the battle of Arbela was observed at Alexandria an hour later. If the time at which an instantaneous phenomenon such as an eclipse of the moon begins at Greenwich (or whatever be the first meridian) is known, and the time of its beginning at whatever place a ship is be then noted, the difference gives the longitude. The eclipses of the moons in Saturn have been used for the purpose. The method is not, however, a practically useful one. Owing to the penumbra it is difficult to observe the exact moment at which an eclipse of the moon begins. In certain positions of Saturn her satellites are not visible. Another method used was to note the lunar distances of certain stars, but the most common and practical method is by the use of well adjusted and carefully corrected chronometers giving Greenwich time.