Cygnus is a high-precision desktop application for generating ephemerides: tables and plots of where the celestial bodies are, sampled at a fixed interval across a date range you choose. Set that interval to a day for a conventional ephemeris, or down to a single second when the question demands it.
Work is organized into studies, each one a configured question—a place, a reference system, a span of time, a sampling interval, a set of bodies, and the measurements you want reported on them. Studies live together in a workspace you save and reopen, so the research you set up once is waiting for you the next time you sit down.
Take Cygnus for a test-drive and see if it's the right fit for you. A 15-day trial license will be automatically created when the application is installed for the first time.
Download for Windows 11 (x64) Download for macOS (M-Series)Geocentric, topocentric, and heliocentric coordinates each come in three forms: a positional ephemeris that tabulates where the bodies are, an aspect ephemeris that adds the cycle angle, phase, and separation of every pair you nominate, and a graphic ephemeris that plots the same figures as time series curves.
A plot carries what a column of numbers cannot—the shape of the motion, its turning points, its crossings, and where it quickens or slows. Longitude, latitude, distance, and speed are each plotted on their own value axis, and every body is drawn in a customizable color. Easily pan, zoom, and inspect curve properties.
Every body you select contributes its measurements as columns, and on an aspect study every valid pair contributes three more alongside them. Show, hide, and reorder columns until the table reads the way you think, jump to the record nearest any date, and check the record count to confirm you generated the volume you expected—the arrangement is remembered with the study.
Export a completed study to CSV for a spreadsheet, a statistics package, or a script—or select a block of rows and copy it straight out as a Markdown table or tab-delimited text. Both follow the column arrangement you set on screen, so what you are looking at is what lands in the file.
Anchor a study to a location, choose the tropical or sidereal zodiac and the ecliptic or equatorial reference plane, then set the span and how finely it is sampled in units from seconds to years. Bodies are drawn from a 33-strong Earth-frame catalog—planets, asteroids, centaurs, uranians, the lunar axis, and the diurnal angles—or from the 24-body heliocentric catalog, each filed under collapsible classification groups.
Save a location and reference system as an ephemeris preset and a body selection as a body list preset, then apply either in a click—or mark one as the default that every new study starts from. Studies are kept together in a workspace file you can reorder and copy within, with activity indicators for running generations and unsaved-changes protection so nothing is lost.
Double-click a record in an ephemeris table—or any plotted point on a graphic ephemeris—and that moment opens as a chart in Compass, cast on the study's own location, frame, bodies, and aspects. Read the figure in Cygnus; see the wheel behind it in Compass.
Pay once and own forever. Every purchase is backed by a 15-day, no-questions-asked money-back guarantee, and you will be up and running in a matter of minutes thanks to our automated licensing system.
Everything in Ephy, plus aspect and graphic ephemerides and time steps down to 1 sec.
Aquila, Compass, and Cygnus in one bundle. The complete toolkit at its best price.