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The Transit of Venus on 2012 June 5/6

Java applet

                        transit map 2012
Transit map courtesy of Fred Espenak - NASA/Goddard Space Flight Center

Geocentric Data


Eclipse begins


Umbra eclipse begins


Greatest eclipse


Umbra eclipse ends


Eclipse ends


Duration 6h 40m

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map subsolar greatest
Planet Applet

At greatest transit (01:30 UT) the image point of the Sun and of Venus (subsolar point) is located at 22.7° N (=declination of the Sun and Venus) and 157.2° E (=360° - Greenwich hour angle of the Sun and Venus) in the Pacific Ocean: there the greatest transit happens in the zenith of the observer:

Location:  E 157°12'00.0", N 22°42'00.0", 0m                
                                                Sun's          Position   Angular
                               UT1       Altitude   Azimuth     Angle    Separation
                            h  m   s         °          °          °          '
Transit Begins             22:12:05.2      44.6       80.0       41.2       16.2
Ingress Interior Contact   22:29:41.2      48.6       81.0       38.6       15.3
Least Angular Distance     01:28:50.0      89.8       95.8        0.0        9.2
Egress Interior Contact    04:27:51.0      49.1      279.0      292.8       15.3
Transit Ends               04:45:25.3      45.1      279.9      290.2       16.2
Duration:  6h 33m 20.1s

Venus is moving across the Sun's disk like this:

subsolar path of venus
                      across the sun

planes ecliptic 

Earth, Mercury, Venus und Mars on 2012 June 6
by my
Planet Applet

The geocentric end of the transit is at 4:49 UT. The borderline separating the sunlit and darkened hemispheres runs from central Africa to Spain, to east of Ireland, and Greenland, which is in agreement with the prediction Proctor's book plate IX, published in 1882.

transit end

Proctor Tansits of Venus

Richard A. Proctor: Transits of Venus (published in 1882), plate IX (2012 transit).

Check your eyes !


Web Links

Richard A. Proctor: Transits of Venus, a popular account of past and coming transits, 4th ed, London 1882 (full text, PDF)

Steven van Roode: Transit of Venus

2012 Transit of Venus

IMCE (Institut de Meécanique Celeste et de Calcul des Ephemerides):
Le passage de Vénus des 5 et 6 Juin 2012

IMCE (Institut de Meécanique Celeste et de Calcul des Ephemerides):
2004-2012: the transits of Venus,

Educational sheets for teachers, students and amateur astronomers

IMCE (Institut de Meécanique Celeste et de Calcul des Ephemerides):
2004-2012: the transits of Venus

Gudrun Bucher: Die Spur des Abendsterns: Die abenteuerliche Erforschung des Venustransits, WBG Damstadt, 2011, ISBN 978-3534236336

Nick Lomb: The Essential Companion to the 2012 Transit of Venus: 1631 to the Present, UNSW Press, 2011, ISBN 978-1742232690

Last modified: 2012, Apr 15