Canopus is a very bright southern star in Carina. Its large distance from the ecliptic makes a longitude-only conjunction especially easy to misread. The calculator therefore lists its reference coordinates but excludes it from automatic longitude matches.
| IAU name | Canopus |
|---|---|
| Designation | Alpha Carinae · HR 2326 |
| Constellation | Carina |
| Visual magnitude in IAU table | -0.62 |
| J2000 right ascension | 95.987958° |
| J2000 declination | -52.695661° |
| Tropical longitude on 1 Jan 2026 | 15.32° Cancer |
| Ecliptic latitude on 1 Jan 2026 | -75.82° |
Reading the coordinates
At the stated 2026 reference instant, the projected tropical position is 15.32° Cancer, with ecliptic latitude -75.82°. Its latitude exceeds the locator’s 40° limit, so the automatic match table excludes it. The projected longitude remains a reference coordinate, not a meaningful claim of visual conjunction.
Right ascension and declination locate Canopus on an equatorial sky map; the tropical position rotates and projects that J2000 direction into a dated ecliptic frame. Precession changes the printed zodiac longitude over centuries. It does not move the star from Carina to a different astronomical constellation. This is why an undated “fixed degree” should be checked against its source.
A useful research question
Could this star rise at the observer’s latitude, and is a longitude-only test useful here? A clear answer identifies the named star, the date, and the method of comparison. Ptolemy’s surviving astrological discussion groups stars by constellation figure and assigns symbolic qualities; it is a historical text, not a measured guide to personal outcomes.
Test a recorded birth moment →
Position calculation
The IAU table identifies the named star and gives its right ascension and declination at J2000. Astronomy Engine rotates that direction to the true ecliptic and equinox of a chosen date. The displayed tropical longitude is the angle around the ecliptic; latitude records how far above or below that plane the star lies. The reference date on this page is 1 January 2026 at 12:00 UTC.
The calculation does not propagate individual stellar proper motion, parallax, or perspective effects. It is intended for modern reference dates, not ancient reconstructions. A planet sharing a projected longitude with a star can still be far away on the sky. The chart locator shows that full angular separation and limits automatic matches to stars within 40° of the ecliptic.