1639 December the 4th
- 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 68.94s
Longitudes are counted positively towards West and negatively towards East.
Parameters at the instant of conjunction in longitude
| Conjunction on 1639/12/4 at 18h 5m 14.64s. | |
|---|---|
| Geocentric longitude of Venus | 252° 31' 32.122". |
| Geocentric latitude of Venus | -0° 8' 49.72". |
| Geocentric longitude of the Sun | 252° 31' 32.122". |
| Geocentric latitude of the Sun | +0° 0' 0.52". |
| Equatorial parallax of the Sun | 8.93". |
| Equatorial parallax of Venus | 33.29". |
| Semi-diameter true of the Sun | 16' 14.7". |
| Semi-diameter true of Venus | 31.58". |
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 4 th at 14h 49m 55.1s | - 67° 30.0' | -42° 52.7' | + 44° 32.0' | -22° 32.0' |
| Ingress, interior contact | the 4 th at 15h 7m 56.9s | - 64° 37.4' | -44° 46.1' | + 49° 3.6' | -22° 31.7' |
| Least angular distance | the 4 th at 18h 25m 37.4s | -119° 13.6' | -62° 33.4' | + 98° 42.0' | -22° 28.9' |
| Egress, interior contact | the 4 th at 21h 43m 19.9s | -115° 38.9' | -15° 9.1' | +148° 20.8' | -22° 26.2' |
| Egress, exterior contact | the 4 th at 22h 1m 21.5s | -112° 3.1' | -13° 5.7' | +152° 52.4' | -22° 25.9' |
Durations of the general phases
- Duration of the general transit : 7h 11m 26.44s.
- Duration of the transit inside the shadow : 6h 35m 22.98s.
Parameters of the shadow and penumbra cones and minimum elongation
- Semi-diameter of the shadow cone : 38.72 R
- Geocentric distance of the edge of the shadow : 17.23 R
- Geocentric distance of the edge of the penumbra : 19.82 R
- Semi-diameter of the cone of penombra : 41.32 R
- Least topocentric distance : 8' 19.272"
Geocentric phases
| Geocentric phases | Date and instant in UTC | Venus being in the Zenith in | Position Angle P | |
|---|---|---|---|---|
| Longitude | Latitude | |||
| Ingress, exterior contact | the 4 th at 14h 56m 48.5s | + 46° 15.8' | -22° 31.9' | +137° 58.4' |
| Ingress, interior contact | the 4 th at 15h 15m 0.7s | + 50° 50.1' | -22° 31.6' | +140° 20.0' |
| Least angular distance | the 4 th at 18h 25m 36.5s | + 98° 41.8' | -22° 28.9' | --- |
| Egress, interior contact | the 4 th at 21h 36m 15.4s | +146° 34.2' | -22° 26.3' | +252° 43.2' |
| Egress, exterior contact | the 4 th at 21h 54m 27.6s | +151° 8.5' | -22° 26.0' | +255° 4.9' |
Durations of the geocentric phases
- Duration of the general transit : 6h 57m 39.15s.
- Duration of the transit of the shadow : 6h 21m 14.68s.
- Least geocentric angular distance : 8' 43.562"
Send your suggestion to the author of the notes : Patrick Rocher, rocher@imcce.fr
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URL: http://www.imcce.fr/ephem/passage_eng/html_passage/VenusP1639.html
Last update : March 4th, 2004. |
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