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public LocationGreenwich, UK
Sunrise: 4:42 
Transit: 13:00 
Sunset: 21:18
sunny   (Daytime)   What's Visible Now?

Tianguan - ζ Tauri (zeta Tauri)

Above the horizon.  Rise: 4:39 | Tran: 12:33 | Set: 20:26
Altitude: 44.5°   Azimuth: 115.0°   Direction: East-South-East

Tianguan, also designated as ζ Tauri (zeta Tauri), is a variable and double giant star of spectral class B4 in the constellation of Taurus.

Tianguan visual magnitude is 3. Because of its brightness, Tianguan is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Celestial coordinates and finder chart of Tianguan

Finder chart Tianguan - ζ Tauri (zeta Tauri) star
Simplified finder chart for Tianguan - ζ Tauri (zeta Tauri).

Tianguan is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Tianguan are provided in the following table:

05h 37m 38s
+21° 08’ 32”
Image of Tianguan - ζ Tauri (zeta Tauri) star
DSS2 image of Tianguan. The red arrow shows the motion of Tianguan during the next 10000 years (0.00 arcmin in Right Ascension and -3.50 arcmin in declination);

Key facts about Tianguan


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where Tianguan is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of Tianguan. Attribution: Richard Powell / CC BY-SA

Tianguan star system properties

Tianguan is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Tianguan double sysyem:

0 arcsec

Distance of Tianguan from the Sun and relative movement

Tianguan is distant 416.88 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

127.88 pc
416.88 ly
20 km/s
-0.021 arcsec/year

Alternative designations of Tianguan

ζ Tauri
(zeta Tauri)

Visibility of Tianguan from your location

Today's Tianguan - ζ Tauri (zeta Tauri) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 68.9°
Max altitude: 59.7°
Azimuth: 291.1°