-1398 May the 20th and the 21st
- 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 36198.11s
Longitudes are counted positively towards West and negatively towards East.
Parameters at the instant of conjunction in longitude
| Conjunction on -1398/5/20 at 23h 0m 14.52s. | |
|---|---|
| Geocentric longitude of Venus | 45° 47' 47.723". |
| Geocentric latitude of Venus | +0° 6' 17.65". |
| Geocentric longitude of the Sun | 45° 47' 47.723". |
| Geocentric latitude of the Sun | -0° 0' 11.13". |
| Equatorial parallax of the Sun | 8.64". |
| Equatorial parallax of Venus | 30.35". |
| Semi-diameter true of the Sun | 15' 42.7". |
| Semi-diameter true of Venus | 28.79". |
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 19h 24m 34.1s | + 5° 25.3' | +45° 53.0' | +113° 12.9' | +17° 1.2' |
| Ingress, interior contact | the 20 th at 19h 40m 20.4s | + 8° 26.9' | +47° 13.7' | +117° 10.5' | +17° 0.9' |
| Least angular distance | the 20 th at 23h 14m 29.8s | - 67° 45.4' | +59° 51.2' | +170° 56.6' | +16° 57.3' |
| Egress, interior contact | the 21 st at 2h 48m 39.9s | - 46° 0.9' | - 1° 8.7' | -135° 17.2' | +16° 53.7' |
| Egress, exterior contact | the 21 st at 3h 4m 26.2s | - 42° 30.8' | - 2° 34.5' | -131° 19.6' | +16° 53.4' |
Durations of the general phases
- Duration of the general transit : 7h 39m 52.13s.
- Duration of the transit inside the shadow : 7h 8m 19.54s.
Parameters of the shadow and penumbra cones and minimum elongation
- Semi-diameter of the shadow cone : 42.10 R
- Geocentric distance of the edge of the shadow : -24.38 R
- Geocentric distance of the edge of the penumbra : -27.03 R
- Semi-diameter of the cone of penombra : 44.75 R
- Least topocentric distance : 6' 2.955"
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 19h 30m 28.9s | +114° 42.0' | +17° 1.1' | + 41° 4.7' |
| Ingress, interior contact | the 20 th at 19h 46m 19.4s | +118° 40.6' | +17° 0.8' | + 39° 31.0' |
| Least angular distance | the 20 th at 23h 14m 31.5s | +170° 57.0' | +16° 57.3' | --- |
| Egress, interior contact | the 21 st at 2h 42m 40.2s | -136° 47.5' | +16° 53.8' | +269° 25.4' |
| Egress, exterior contact | the 21 st at 2h 58m 30.8s | -132° 48.9' | +16° 53.5' | +267° 51.7' |
Durations of the geocentric phases
- Duration of the general transit : 7h 28m 1.85s.
- Duration of the transit of the shadow : 6h 56m 20.88s.
- Least geocentric angular distance : 6' 24.608"
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/VenusN1398.html
Last update : March 4th, 2004. |
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