Search results
Results From The WOW.Com Content Network
Sample output from an astrology program. The table above the natal chart shows the birth time, location, and the positions of the planets in the signs and houses. The other table lists the aspects and their respective orbs. Astrology software is a type of computer programs designed to calculate astrological horoscopes. Many of them also ...
In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ər ɪ s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛr ɪ ˌ d iː z /; from Latin ephemeris ' diary ', from Ancient Greek ἐφημερίς (ephēmerís) ' diary, journal ') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the ...
The horizontal, or altitude-azimuth, system is based on the position of the observer on Earth, which revolves around its own axis once per sidereal day (23 hours, 56 minutes and 4.091 seconds) in relation to the star background. The positioning of a celestial object by the horizontal system varies with time, but is a useful coordinate system ...
So, for 2007, a person born on April 2, 1982, would have a progressed chart drawn up based on the position of the planets moved forward 25 degrees from their position on that birth date (it is important to note that this creates a chart of planetary positions that never existed in real life).
Viewed from the same location, a star seen at one position in the sky will be seen at the same position on another night at the same time of day (or night), if the day is defined as a sidereal day (also known as the sidereal rotation period). This is similar to how the time kept by a sundial can be used to find the location of the Sun
Mean equinox of date is the intersection of the ecliptic of "date" (that is, the ecliptic in its position at "date") with the mean equator (that is, the equator rotated by precession to its position at "date", but free from the small periodic oscillations of nutation). Commonly used in planetary orbit calculation. True equinox of date
An interactive calculator showing the Sun's path in the sky. NOAA Solar Calculator, at the NOAA Earth System Research Laboratories's Global Monitoring Division website. NOAA's declination and sun position calculator; HORIZONS System, at the JPL website. Very accurate positions of Solar System objects based on the JPL DE series ephemerides.
The difference between the two instruments is that the astrolabe measures the time and position of the sun and stars at a specific location in time. [7] In contrast, the equatorium is used to calculate the past or future positions of the planets and celestial bodies according to the planetary theory of Ptolemy. [citation needed]