Ephemeris is a tool used in astrology to track the movements of planets and improve one’s understanding of the zodiac. It is expressed in GMT and can be converted to your time zone by subtracting 4 hours for Atlantic, 5 hours for Eastern, 6 hours for Central, 7 for Mountain, and 8 for Pacific. During Daylight Saving Time, one hour is added less. The twelve equal signs of the zodiac are 30 degrees each, measured in celestial “longitude”.
To read an ephemeris, you can use the Ephemeris Calculator, which can help you check the rising sun, book, astrodienst, formula, and more on Astro Seek. To convert to your time zone, subtract 4 hours for Atlantic, 5 hours for Eastern, 6 hours for Central, and 8 for Mountain.
A progressed chart in astrology is calculated according to the “day per year” system, meaning that one year of life translates into one day on the ephemeris. A monthly ephemeris won’t give a precise calculation since the moon and any planet can change signs at any time in the middle of a day.
The Almagest Ephemeris Calculator can also be used for predicting the date and time (to the nearest second if desired). Ephemeris time refers to time in association with any ephemeris (itinerary of the trajectory of an astronomical object). The Greenwich Mean Time is obtained by adding four minutes for each degree of longitude to the true local time of birth.
In the future, all phases of dynamical astronomy will be carried out in terms of ephemeris time as the independent, uniformly increasing time-variable.
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Learn the basics of Vedic Astrology on Sri Vidya – Jyothishya Basics Youtube channel. This video is on manual calculation of …
What is the correct way to calculate time?
The calculation of time is based on the division of distance by speed.
How accurate is an ephemeris?
The precision of ephemerides is constrained by the utilization of satellite motion models and inaccuracies inherent to observational data. The assessment of the accuracy of ephemerides is a complex undertaking. This information is derived from ScienceDirect, a website that utilizes cookies and holds copyright for text and data mining, AI training, and analogous technologies. The Creative Commons licensing terms apply to open access content.
What is the most accurate ephemeris?
The Horizons service provides the most up-to-date orbit data and precise ephemerides for any celestial object. Orbital elements may be employed for certain purposes, and data may be obtained from planetary satellite mean element tables, small-body element tables, SBDB lookup and query tools, and precomputed SPK files for planets and natural satellites. Additionally, the generation of binary ephemeris files can be performed on demand.
What is the validity period of ephemeris?
The active ephemeris validity period is typically 4 hours, and if exceeded, the data must be refreshed. GPS/GNSS receivers can calculate their position from new ephemeris data for a maximum of 4 hours. However, devices with onboard GPS need to re-calculate their position if turned off for more than 4 hours. Self-Ephemeris™ technology solves this problem by allowing a startup equivalent to a hot start for up to 72 hours, independently performed by the GPS/GNSS receiver.
This technology uses a specialized algorithm to predict and estimate the orbital information of a satellite based on previously received ephemeris data, allowing the GPS/GNSS receiver to have a TTFF in the same amount of time as a hot start.
How does ephemeris time work?
André Danjon and Gerald Clemence proposed a timescale called Ephemeris Time (ET) in 1952, based on the Earth’s orbital motion. The working definition was based on a mathematical expression for the longitude of the Sun as a function of time. This concept was later adopted by B. E. Blair in his book, Time and Frequency: Theory and Fundamentals. Other notable contributions include D. Bouwer’s study of Earth’s rate of rotation and E. W. Brown’s theory of the motion of the moon, which included a new calculation of the Moon’s coordinates in terms of time.
What time zone is ephemeris in?
The ephemeris is a tool used to calculate the zodiac sign, which is expressed in GMT. The twelve equal signs of the zodiac are measured in celestial “longitude”, with positions listed in degrees, minutes, and seconds. The ephemeris is used to convert to your time zone, with the Atlantic, Eastern, Central, Mountain, and Pacific time zones being the most affected.
The position of planets is listed in the “planet ingress” list at the bottom, with a space between the two months that share the page. The “Astro Data” column on the left tells you when planets turn Retrograde (R) or Direct (D) and when two outer planets have an aspect. The degrees of these phenomena are not listed, but you can “ballpark” them from the row for the applicable date.
During Daylight Saving Time, the time zone is adjusted by subtracting one hour less. The ephemeris also shows the exact date and time a planet enters a sign in the “planet ingress” list at the bottom.
How long is ephemeris data valid?
Each satellite transmits the entirety of the almanac, which is valid for 180 days. The ephemeris, on the other hand, is a set of orbital parameters for each satellite, which is valid for approximately four hours when received. Each satellite transmits data pertaining to its own status.
How to calculate ephemeris time?
An ephemeris can be computed using knowledge of the planet’s orbital elements, planetary and stellar radii, or a known transit midpoint epoch and duration time. The algorithm determines if any parameters are missing after collecting necessary inputs. To convert a Julian Date to a calendar date, define quantities like int(x), where int(x) denotes the largest whole number less than or equal to (x), and the calendar date is given by the given quantity.
What is ephemeris time J2000?
Ephemeris time is a measure of seconds past a reference epoch, such as J2000 (Jonathan 1, 2000). The Toolkit software provides information on the J2000 epoch’s current seconds. SPICE uses a double precision value for TDB in all Toolkits. TDB is a formal time, but it coincides with atomic time within measurements limits, making it relatable to everyday time expressions. Ephemeris time is a count of seconds past the reference epoch.
What is the Equation of Time ephemeris?
The Equation of Ephemeris Time, a common formula found in textbooks, is a simplified approximation of the mean Sun’s longitude (L) and the right ascension (a) of the apparent Sun. This approximation results in the following relationships: ST° = L° -180 and Dynamical Time = UT.
How long is ephemeris day?
The term “ephemeris time” is used to describe a method of predicting the position of the sun and moon based on their current position. This method is based on the concept of one ephemeris day on Earth being 24 hours.
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I went back and re-read the intro to the American Ephemeris for 1950-2050 after we finished recording this episode, and it says that it uses Universal Time, which is essentially the same as Greenwich Mean Time for London. So I would recommend going with the noon version of the ephemeris if you live in the US, because then it will start the day a bit closer to when the actual start of the day is in most time zones in the US, basically by offsetting it by 12 hours.
This was a great episode. I appreciated learning about the recurrence of Mercury and Venus retrograde cycles and eclipses. Thank you for pointing out that a print ephemeris can be very helpful for secondary progressions and getting familiar with historical planetary aspects. Take care and much gratitude to you both for sharing your wisdom!
20 consultations per week might be very realistic right now. I have the impression that right now almost everyone and esp. the whole hipster community is running like crazy towards astrologers and other spiritual practicioners. However as an astrologer right now you can earn the money of your life, which is great! By the way, how long does a new client have to wait at the moment for a consultation with Patrick.
I learned astrology in the mid 70s. Even as late as the mid 1990s, most astrologers I knew were hand calculating. As someone who personally has 4 (count ‘em 4) planetary stations in my birth chart, I can’t begin to sing the importance of looking beyond the static birth chart for interpretation in context.
I’m glad you’ve brought up SD & SRx. I find that planets in these states are very, very dominant in the natives chart. There is a site you can go to which gives charts of people with a focus on people born with Stationary Planets. I read charts and if people are expressing that they don’t see themselves very strongly in the 3 Majors I look for SD or SRx planets after aspects, patterns are exhausted. I found this thru personal experience as I have 2 SD planets Neptune and Jupiter (conjunct Ceres) in Scorpio and Mercury SRx in Leo (conjunct my Uranus). And my SRx Mercury is square my SD Jupiter. I can talk n talk, dramatically (Leo) about allsorts of subjects in deep (Scorpio) way. It gave me some indication why people frequently guessed me as a Scorpio. I also have Mars, Pluto, Vesta and Venus conjunct. The first 3 super conjunct which also adds to the tendencies. The 2 SD planets also trine my Cancer Sun and Asc
Great episode. I’d love a lesson on how to use an astrolabe and how house cusps are determined using it. Would the cusps be Placidus or some other quadrant system? It seems, in the Astrodienist Ephemeris May 16, 2021 Sidereal Time 15:35 refers to Greenwhich Mean Sidereal Time. I believe at midnight on May 16 at Greenwhich, England, the Meridian plane (at 180 degrees in Azimuth; due South) intersects the Equator at 15:35 RA (Right Ascension) I may be wrong about that, though, it may be measuring RA at the intersection of the Meridian and the Ecliptic instead. On May 5, at midnight, at Greenwhich England, the GMST in the Ephemeris is 14:52. Zuben Elgenubi, at 0:20 North Celestial Latitude, Declination 16:08 South, 14:52 RA culminates due South 4 minutes before midnight. With a Celestial Latitude of 58:14 South, Declination 79:08 South, RA 14:51, Alpha Apodus Culminates 6 minutes before midnight. Alpha Apodus will not rise in the Northern Hemisphere, being too far south, but will reach the closest to the to rising, below the horizon, when it culminates. So, any star having an RA, matching the sidereal time listed in the Ephemeris will be approximately culminating in the sky at midnight in Greenwhich England. Reading down the Sidereal column in the Ephemeris the year begins at 6:43, ticks up every day, reaching 23:56 on September 20, then turns over to 0 on the 21st. The numbers then tick up again to end the year at 6:39. 0 and 12 occur approximately at the equinoxes, 6 and 18 at the solstices.
I bought my first ephemeris in 1996: “The Complete Ephemerides 1920-2020 international edition”, Aureas. (2020 felt like a very long way into the future then). I did not know how much I loved it until the end of 2020, when I realized that there was no sequel “2020-2120” to buy! The one I bought instead was “The Astrolabe World Ephemeris 2000-2050”. It is nothing like my first! I wish I had listened to this episode before I bought it. PS. Could you two make an episode on the Midheaven in other houses than the tenth (when you use whole sign houses)? I myself have the MC in the ninth house and I have a friend with MC in the first. Obviously the IC falls in other houses than the 4th as well. What does all this mean?
Another great article! I’ve not used my ephemeris for a long time mostly because I thought it was confusing and old school. I totally stand corrected and now see how totally useful it can be. I’m going to blow the dust off the ones I have and crack them open! How enlightening and embarrassing at the same time 🤣👍🤭🙄 Thanks again!
I received a birthday gift to have a reading from Patrick Watson and decided to look him up. I had also asked for an ephemeral for my birthday but couldn’t wait so I got the Astro pdf, and so it was a nice surprise to find this episode combining both. Muchly appreciate the stories of how much use you both gave the print versions in addition to the factual instruction. I’m still in the elementary stages of learning about progressions and other timing techniques, so if a client asks about the potential for relationship and their Venus return won’t be for another couple of years, is there some quick way to use the ephemeris to point out interim periods to pay attention to?
At 1:49:50 that is so true. I was born with Saturn Retrograde. In my Progressed Chart Saturn Stationed Direct on my 2nd Saturn return and at the same time Transiting Saturn Stationed Direct. Really horrible. My life has turned to shit. Saturn reinforced what Uranus had done by stationing Rx on my MC just prior. I was accused of bashing a kid a high school. I had done no such thing. I was sacked without investigation; extremely rare in Australia. I became homeless, l couldn’t get Social Security for 3 months because l was sacked for a ‘criminal’ offence, l had no money, l cashed in my meagre retirement money which paid off credit card debt, l built a mobile workshop but got diagnosed with cancer and a hernia. End of working life as it turned out. The hernia got repaired but has failed and it has caused a second one to ccur and that can’t be fixed till the first one is fixed and that has a less of a chance at success second time round and the secondary one is dependent on the first being repaired successfully. Sheesh. I then became bankrupt, no-one will employ a “child-abuser”, no-one will go out with a jobless, moneyless, unfit “child-abuser … #MeToo anyone? So I spend days …..
I came across and started perusal this episode today because I needed to learn more about how to navigate the timing issues I have with the ephemeris. So I use The American Ephemeris1950-2050 at midnight and it is based on Universal Time. I am having difficulty understanding the conversion then for US central time. So at midnight UT it is actually 6 hours ahead of US CT which means it seems I am really looking at the previous day 6 hours earlier? So for instance at 12am UT 2/6/22 is actually 6pm 2/5/22. I’m really confused after realizing this. How do I use this ephemeris accurately, do I look at the previous day or do I just get one at noon then it will at least reflect the same day? Hope you can shed some light on this Chris.