chronometers at the beginning of the 18th century, a few decades after the invention of Huygens did not differ even greater accuracy, and therefore it was impossible to use only their testimony in determining the location of the ship;only during the 19th century they became quite suitable for their purpose.
Thus, for 1/2 centuries Moon has the same assistance as it had through calculations Regiomontanus Amerigo Vespucci;it would continue to provide this service in cases where the chronometer refuses to perform its function, or when his testimony will need monitoring.Moon: study ...
moon This assistance is based on the theory that the Moon movement, have been increasingly perfected, calculated for several years for periods of time, one after the other at least three hours, place, occupies the center of the lunar disk relatively bright stars and relative to the sun;these calculations are published in the tables, the so-called almanacs, and yearbooks.
When such a position of the moon is known in the moment of observation within a few seconds of arc, assuming no Greenwich time, then measured using an appropriate meter distance of the moon from the sun or some other star, whose position at the moment is known, can be foundhence Greenwich time t. e, the equatorial latitude zenith or Greenwich meridian.
(local meridian is none other than the great circle passing through the pole and the daily rotation of the zenith point at this point).This definition makes it possible to find the longitude of your observing site similar to how this can be achieved by means of a chronometer, which we discussed above.
basis for more accurate calculation of the provisions of the moon in the sky was supposed writings of Newton;the task of the observers, theoreticians and calculators who came after him, and is merely to further improve the theory and practice of computing.At all times, the moon had a great impact on the ground.Very often on the ground strange things happen when the moon was part of a particular zodiac sign (Moon in Sagittarius, Moon in Taurus).
Moon: study
