Any astrologer’s toolkit should include an ephemeris. An ephemeris, which is Latin for “diary,” records the planets’ daily journey through the zodiac signs down to the degree and minute. Do you want to know where Jupiter was six years ago when you got your ideal job? When you finally dumped that person who made your life a living misery, where did Mars land? Perhaps you’re planning a significant event this year, such as a wedding, and you’re hoping to get a favorable date.
In This Article...
What is an astrological ephemeris, and how does it work?
An ephemeris (plural: ephemerides) is a book containing tables in astronomy and celestial navigation that shows the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., their position (and presumably velocity) through time. The word ephemeris comes from the Latin word ephemeris, which means ‘diary’, and the Greek word ephemeris, which means ‘diary, journal.’ Historically, positions were published as printed tables of values with dates and times at regular intervals. One of the first applications of mechanical computers was the calculation of these tables. Ephemerides are frequently available in electronic format nowadays. Printed ephemerides, on the other hand, are still created because they are valuable when computational devices are unavailable.
The astronomical position computed from an ephemeris is frequently expressed in the spherical polar coordinate system of right ascension and declination, as well as the distance from the origin, if applicable. Eclipses, apparent retrograde motion/planetary stations, planetary ingresses, sidereal time, positions for the mean and true nodes of the moon, the phases of the Moon, and the positions of small celestial bodies such as Chiron are some of the astronomical phenomena of interest to astronomers.
Ephemerides are used in astronomy and celestial navigation. Astrologers use them as well.
What is the content of an ephemeris?
- week number, satellite accuracy and health, data age, satellite clock correction factors, and orbital parameters are all included.
- valid for two hours before and after the ephemeris time (toe). The toe can be regarded of as the point at which the data from the GNSS control segment was computed.
- Used to compute satellite coordinates in real time, which is necessary for position computation.
Almanac:
- is less accurate than ephemerides in terms of orbital information
- good for a maximum of 90 days
- It was used to reduce the time to the first fix by 15 seconds (compared to not having almanac stored)
How is the ephemeris calculated?
An ephemeris can be calculated in one of two ways: knowing the planet’s orbital elements and planetary and stellar radii, or knowing the transit midpoint epoch and duration time. After all of the essential inputs have been gathered, the algorithm checks to see if any parameters are missing.
Who created the ephemeris?
Nabu-rimanni, also spelled Naburianos, Naburiannuos, Naburiannu, or Naburimannu (flourished c. 491 bc, Babylonia), the first Babylonian astronomer known by name, established the so-called System A, a set of ephemerides, or tables, that show the positions of the Moon, Sun, and planets at any given time.
What is the purpose of the ephemeris data?
- Trimble’s Online Planning page
- The Satellite Predictor Tool from Navcom
- The current locations of GPS satellites (& WAAS =#133, 135 & 138) are shown here.
(Green = WAAS Precision Approach, Yellow = Low Precision, Blue = WAAS Out of Range, Red = Unhealthy, Do Not Use)
Ephemeris data is transmitted by GPS satellites and contains information on their current and anticipated location, time, and “health.” The GPS receivers utilize this information to calculate their position in relation to the satellites and, as a result, their position on the earth. The Ephemeris Data can also be used to forecast future satellite circumstances (for a given location and time), allowing you to plan when (and when not) to collect GPS data.
Ephemeris data required to be downloaded and used using special desktop applications until recently (i.e., Trimble Planning or Quick Plan). However, the ephemeris data can now be accessible via the internet (see links above). Data from the ephemeris is deemed valid for up to 30 days (maximum). It is recommended that you repeat your forecasts a week or two before collection if you are attempting to estimate GPS conditions for more than 30 days in the future (satellite conditions are constantly changing).
What are ephemeris parameters, and what do they mean?
An ephemeris is a table that shows the coordinates of a celestial body at various times throughout a period of time. The word derives from the same Greek source as “ephemeral,” which originally meant “short-lived” but has since evolved to signify “insignificant.” The ephemeris, on the other hand, is not insignificant in GNSS systems.
Each GNSS satellite broadcasts ephemeris data as part of its signal. This is a set of parameters that may be used to correctly compute a satellite’s location at any given time, and hence characterizes the path the satellite is taking as it orbits Earth.
Ephemeris data is only valid for a short period, as the name implies (a few hours or less). As a result, current ephemeris data is required to reduce mistakes caused by tiny deviations in a satellite’s orbit.
Ephemeris data play a crucial part in various tests when utilizing a GNSS simulator to evaluate GNSS receivers. When assessing a receiver’s time to first fix (TTFF) performance, for example, the cold-, warm-, and hot-start tests have different criteria. The receiver must receive time, almanac, and ephemeris data in order to perform a cold-start test. All of the data is already in the receiver for a hot-start test. The receiver, on the other hand, already has the time and almanac data for the warm-start test, but it requires new ephemeris data.
What is an ephemeris talisman, exactly?
Handcrafted to last a lifetime, this birth chart talisman is gorgeous and accurate. As the stars fluctuate, stay grounded. Your cosmic energy should be radiated. Learn how to read your soul’s map. With your birth chart, you may learn about astrology.
What are the origins of astrological symbols?
Symbols such as zodiac signs and classical planets are frequently employed. These are from Byzantine codices from the Middle Ages. Their current form is a result of the Renaissance in Europe. In several astrological traditions, other symbols indicating astrological aspects are utilized.