In this case, knowing the astronomical calculations of the position of the sun at any time, you can simply, with the help of measurements of the height of the sun to determine the position of the point to the zenith of whatever time;for it is only necessary to have a tool with which you can measure and take into account the movement of the zenith point, regardless of the earth's rotation around its axis, ie. e. to eliminate the influence of the apparent rotation of the celestial svoda.Solntsa and moon in Drevnem World ...
knownthat the position of celestial bodies, as well as the zenith for different parts of the globe on the celestial sphere is defined exactly the same as determined by the position of the different points of the earth, namely the equatorial and longitude;latitude.The first meridian from which longitude considered (at the equator), is the one that passes through the celestial pole and the vernal equinox.Even in ancient times people knew that the moon is in the sign of the zodiac, and each sign, it is a certain time, then it goes to sleduyushy zodiac sign, the Moon in Aries, Moon in Cancer ....
equatorial latitudes kakoy-any point in the sky is considered the smallest arc distance from the celestial equator, while the geographical latitude of any "point of the earth's surface is considered the angle between the direction of the steep terrain with a plane parallel to the equatorial plane.
Therefore, positioning calculations of solar motion at any time to determine the equatorial latitude and longitude of the sun;hence producing the above two measurements of the sun by means of a chronometer, featuring a completely uniform changes in the equatorial longitude zenith in the place of observation, it is possible to determine the longitude and latitude equatorial zenith for a moment you want.
But on the basis of the foregoing, the equatorial zenith in the place of observation is none other than the latitude of the point.Equatorial same longitude of the zenith is not even him values for determining the place of the earth's surface, because it is considered not from any particular meridian on the earth, and from the above-mentioned first meridian of the celestial sphere;regarding this meridian zenith continuously changes its position due to the rotation of the earth.
the sun and moon in Drevnem World
