Astrology In New Time: The Moon

Therefore, in order to accurately determine any place on the earth's surface, it is necessary to know that equatorial longitude, which at the moment has the zenith of another place, the position of which on the map is already known. The easiest way is to take the zenith of such a place, which is considered the first meridian in determining the geographical longitudes on the map (such a place is currently Greenwich.

Thus, in order to determine for any moment the geographical longitude of the place where the ship is located, it is necessary to be able to determine for the given moment the equatorial longitude of the zenith of Greenwich, in other words, it is necessary to know the so-called star time of the Greenwich meridian.

For this purpose, there are now many good chronometers on large ships. Before sailing, these chronometers are set so that they show the average solar time of the Greenwich meridian (hence it is easy to calculate and stellar time). In ancient times people knew that the moon is in the signs of the zodiac, the Moon in Pisces, the Moon in Scorpio ....

The difference between the stellar time in Greenwich, calculated on the basis of the readings of the chronometer, and the equatorial zenith longitude or the stellar time of the place at which the zenith point is determined, is the geographic longitude under which the ship is at a given time; Knowing, therefore, geographical longitude and determining the geographical latitude, which, based on the above, is even simpler, you can determine the position of the ship on the map. Astrology In New Time : Moon ...

(To understand this technique, it is unimportant that in practice, instead of the so-called stellar time, the average solar time of the Greenwich meridian and the mean solar time of the place where the ship is located are usually used, since the zenith for the ship is the easiest and most often determined on the basis of the position of the sun On the celestial vault, for this purpose the distance of the sun from the horizon is measured).

For the purposes of navigation, Regiomontan, and then Kepler, compiled tables of solar motion, which differed already with great accuracy; Using these tablets, it was possible to determine, by observations of the sun, the zenith position of the place of observation at any time.

Astrology In New Time: The Moon