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 the first time the application is opened. That first launch needs an internet connection.
Download for Windows 11 (x64) Download for macOS (M-Series)Track where every body stands, or how any pair relates, as a table or as curves. Measure from Earth's center, your own location, or the Sun.
A plot shows what a column of numbers cannot: the shape of the motion, its turning points, its crossings, and where it quickens or slows.
Every body you select reports its measurements as columns, and on an aspect study every pair adds its cycle angle, phase, and separation. Arrange the table to suit your question and jump to any date.
Export a study to CSV for a spreadsheet, statistics package, or script, or copy a block of rows straight out as a Markdown table.
Pick a place, zodiac, origin, and plane, then sample any span—every second to every year—across up to 33 bodies, planets to uranians.
Reuse a place and reference system, or a list of bodies, as a preset. Keep related studies together in a workspace.
Double-click a record in an ephemeris table, or any plotted point on a positional or aspect graph, 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.