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• Parameters at the instant of the conjunction in longitude.
• General phases.
• Geocentric phases.
• Back to the canon of the transits of Venus.

All the instants are given in Universal Time, for the present date the value of the difference between the Terrestrial Time TT and the Universal Time UT is taken as 25091.31s
Longitudes are counted positively towards West and negatively towards East.

Conjunction on -912/5/21 at 9h 8m 15.81s.
Geocentric longitude of Venus	50° 21' 58.442".
Geocentric latitude of Venus	+0° 3' 38.45".
Geocentric longitude of the Sun	50° 21' 58.442".
Geocentric latitude of the Sun	-0° 0' 6.04".
Equatorial parallax of the Sun	8.64".
Equatorial parallax of Venus	30.33".
Semi-diameter true of the Sun	15' 42.8".
Semi-diameter true of Venus	28.78".

Phases	Date and instant in UTC	Position of the contacts		Venus being in the Zenith in
		Longitude	Latitude	Longitude	Latitude
Ingress, exterior contact	the 21 st at 5h 13m 26.6s	+157° 24.1'	+35° 11.2'	- 99° 40.7'	+18° 14.0'
Ingress, interior contact	the 21 st at 5h 28m 17.6s	+160° 43.6'	+35° 55.9'	- 95° 57.0'	+18° 13.8'
Least angular distance	the 21 st at 9h 16m 30.4s	+ 86° 12.7'	+60° 16.7'	- 38° 39.0'	+18° 10.0'
Egress, interior contact	the 21 st at 13h 4m 43.5s	+105° 0.3'	- 9° 51.4'	+ 18° 39.0'	+18° 6.3'
Egress, exterior contact	the 21 st at 13h 19m 34.6s	+108° 27.0'	-10° 37.5'	+ 22° 22.7'	+18° 6.0'

Durations of the general phases

• Duration of the general transit : 8h 6m 7.97s.
• Duration of the transit inside the shadow : 7h 36m 25.88s.

Parameters of the shadow and penumbra cones and minimum elongation

• Semi-diameter of the shadow cone : 42.14 R
• Geocentric distance of the edge of the shadow : -31.90 R
• Geocentric distance of the edge of the penumbra : -34.55 R
• Semi-diameter of the cone of penombra : 44.79 R
• Least topocentric distance : 3' 20.438"

Geocentric phases	Date and instant in UTC	Venus being in the Zenith in		Position Angle P
		Longitude	Latitude
Ingress, exterior contact	the 21 st at 5h 19m 1.6s	- 98° 16.6'	+18° 13.9'	+ 52° 35.0'
Ingress, interior contact	the 21 st at 5h 33m 53.8s	- 94° 32.6'	+18° 13.7'	+ 51° 44.3'
Least angular distance	the 21 st at 9h 16m 30.4s	- 38° 39.1'	+18° 10.0'	---
Egress, interior contact	the 21 st at 12h 59m 6.9s	+ 17° 14.5'	+18° 6.4'	+260° 0.7'
Egress, exterior contact	the 21 st at 13h 13m 59.2s	+ 20° 58.5'	+18° 6.1'	+259° 10.1'

Durations of the geocentric phases

• Duration of the general transit : 7h 54m 57.51s.
• Duration of the transit of the shadow : 7h 25m 13.10s.
• Least geocentric angular distance : 3' 42.074"

URL: http://www.imcce.fr/ephem/passage_eng/html_passage/VenusN912.html Last update : March 4th, 2004.