1275 May the 25th and the 26th
- 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 691.19s
Longitudes are counted positively towards West and negatively towards East.
Parameters at the instant of conjunction in longitude
| Conjunction on 1275/5/25 at 22h 54m 20.69s. | |
|---|---|
| Geocentric longitude of Venus | 71° 0' 1.583". |
| Geocentric latitude of Venus | -0° 7' 30.28". |
| Geocentric longitude of the Sun | 71° 0' 1.583". |
| Geocentric latitude of the Sun | -0° 0' 0.45". |
| Equatorial parallax of the Sun | 8.66". |
| Equatorial parallax of Venus | 30.38". |
| Semi-diameter true of the Sun | 15' 44.5". |
| Semi-diameter true of Venus | 28.83". |
General phases
| Phases | Date and instant in UTC |
Position of the contacts | Venus being in the Zenith in | ||
|---|---|---|---|---|---|
| Longitude | Latitude | Longitude | Latitude | ||
| Ingress, exterior contact | the 25 th at 18h 55m 5.5s | + 18° 36.6' | - 9° 13.6' | +104° 24.2' | +22° 6.6' |
| Ingress, interior contact | the 25 th at 19h 11m 20.6s | + 23° 21.9' | -10° 52.9' | +108° 29.1' | +22° 6.4' |
| Least angular distance | the 25 th at 22h 37m 46.9s | +122° 23.9' | -62° 35.9' | +160° 19.6' | +22° 3.6' |
| Egress, interior contact | the 26 th at 2h 4m 11.3s | - 78° 50.9' | -40° 50.1' | -147° 50.4' | +22° 0.8' |
| Egress, exterior contact | the 26 th at 2h 20m 26.5s | - 73° 38.4' | -39° 17.1' | -143° 45.5' | +22° 0.6' |
Durations of the general phases
- Duration of the general transit : 7h 25m 21.08s.
- Duration of the transit inside the shadow : 6h 52m 50.67s.
Parameters of the shadow and penumbra cones and minimum elongation
- Semi-diameter of the shadow cone : 42.15 R
- Geocentric distance of the edge of the shadow : 21.67 R
- Geocentric distance of the edge of the penumbra : 24.32 R
- Semi-diameter of the cone of penombra : 44.80 R
- Least topocentric distance : 7' 3.258"
Geocentric phases
| Geocentric phases | Date and instant in UTC | Venus being in the Zenith in | Position Angle P | |
|---|---|---|---|---|
| Longitude | Latitude | |||
| Ingress, exterior contact | the 25 th at 19h 1m 11.1s | +105° 56.0' | +22° 6.5' | +100° 33.5' |
| Ingress, interior contact | the 25 th at 19h 17m 32.4s | +110° 2.4' | +22° 6.3' | +102° 26.2' |
| Least angular distance | the 25 th at 22h 37m 45.6s | +160° 19.2' | +22° 3.6' | --- |
| Egress, interior contact | the 26 th at 1h 57m 60.0s | -149° 23.7' | +22° 0.9' | +224° 28.1' |
| Egress, exterior contact | the 26 th at 2h 14m 21.4s | -145° 17.2' | +22° 0.7' | +226° 20.8' |
Durations of the geocentric phases
- Duration of the general transit : 7h 13m 10.30s.
- Duration of the transit of the shadow : 6h 40m 27.57s.
- Least geocentric angular distance : 7' 24.926"
Send your suggestion to the author of the notes : Patrick Rocher, rocher@imcce.fr
|
URL: http://www.imcce.fr/ephem/passage_eng/html_passage/VenusP1275.html
Last update : March 4th, 2004. |
 |