-1641 May the 20th
- 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 42532.74s
Longitudes are counted positively towards West and negatively towards East.
Parameters at the instant of conjunction in longitude
| Conjunction on -1641/5/20 at 18h 0m 7.45s. | |
|---|---|
| Geocentric longitude of Venus | 43° 31' 58.069". |
| Geocentric latitude of Venus | +0° 7' 31.44". |
| Geocentric longitude of the Sun | 43° 31' 58.069". |
| Geocentric latitude of the Sun | -0° 0' 13.47". |
| Equatorial parallax of the Sun | 8.64". |
| Equatorial parallax of Venus | 30.36". |
| Semi-diameter true of the Sun | 15' 42.6". |
| Semi-diameter true of Venus | 28.80". |
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 20 th at 14h 36m 0.7s | - 69° 31.6' | +51° 2.5' | + 41° 5.9' | +16° 22.5' |
| Ingress, interior contact | the 20 th at 14h 52m 29.2s | - 66° 46.0' | +52° 41.6' | + 45° 14.0' | +16° 22.2' |
| Least angular distance | the 20 th at 18h 17m 11.6s | -143° 48.9' | +59° 38.8' | + 96° 37.7' | +16° 18.7' |
| Egress, interior contact | the 20 th at 21h 41m 54.1s | -121° 25.4' | + 3° 12.0' | +148° 1.3' | +16° 15.2' |
| Egress, exterior contact | the 20 th at 21h 58m 22.4s | -117° 50.0' | + 1° 24.5' | +152° 9.5' | +16° 14.9' |
Durations of the general phases
- Duration of the general transit : 7h 22m 21.68s.
- Duration of the transit inside the shadow : 6h 49m 24.93s.
Parameters of the shadow and penumbra cones and minimum elongation
- Semi-diameter of the shadow cone : 42.08 R
- Geocentric distance of the edge of the shadow : -20.90 R
- Geocentric distance of the edge of the penumbra : -23.55 R
- Semi-diameter of the cone of penombra : 44.73 R
- Least topocentric distance : 7' 18.257"
Geocentric phases
| Geocentric phases | Date and instant in UTC | Venus being in the Zenith in | Position Angle P | |
|---|---|---|---|---|
| Longitude | Latitude | |||
| Ingress, exterior contact | the 20 th at 14h 42m 10.6s | + 42° 38.7' | +16° 22.4' | + 35° 29.0' |
| Ingress, interior contact | the 20 th at 14h 58m 45.8s | + 46° 48.6' | +16° 22.1' | + 33° 31.7' |
| Least angular distance | the 20 th at 18h 17m 11.0s | + 96° 37.5' | +16° 18.7' | --- |
| Egress, interior contact | the 20 th at 21h 35m 36.6s | +146° 26.6' | +16° 15.3' | +274° 5.0' |
| Egress, exterior contact | the 20 th at 21h 52m 11.8s | +150° 36.4' | +16° 15.0' | +272° 7.6' |
Durations of the geocentric phases
- Duration of the general transit : 7h 10m 1.26s.
- Duration of the transit of the shadow : 6h 36m 50.81s.
- Least geocentric angular distance : 7' 39.922"
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/VenusN1641.html
Last update : March 4th, 2004. |
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