Venus from now to next June

earthsky.org | 10/15/2019 | Guy Ottewell
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Click For Photo: https://en.es-static.us/upl/2019/10/venus-2019-2020-ottewell-north-lg-1-300x169.jpg

View larger. | Chart by Guy Ottewell, and via his blog.

Reprinted with permission from Guy Ottewell’s blog.

Venus - Apparition - August - June - Type

Venus is creeping out into a great evening apparition from August 2019 to June 2020. It’s of the type that – as Eric David reminded us in his comment on my October 12 post – will end with a very close passage in front of the sun: the close passage that produced the famous Venus transits of the past. The chart above shows Venus as it appears above the sunset horizon over the whole of this evening apparition, as seen from latitude 40 degrees north.

The sunlit disks of Venus are exaggerated 480 times in size, otherwise they would all be dots too small to see. You can think of each as what you would see through your binocular or telescope.

Scene - Degrees - Latitude - Buenos - Aires

And here is how the same scene will appear, very differently, from 35 degrees south, a latitude roughly suiting Buenos Aires, South Africa, Australia, and New Zealand:

View larger. | Chart by Guy Ottewell, and via his blog.

Line - Equator - Locations - Sunset - Horizon

The dashed line is the celestial equator, which for northern locations slopes up leftward from the sunset horizon, rightward for southern locations. No other features, such as the sun, stars, or the ecliptic, can be included, because in diagrams of this kind, based on altazimuth difference from the west point on the horizon, they are in different positions for every date. Venus is always on or near the ecliptic.

This type of apparition occurred eight years ago, and 16, and so on, in the eight-year Venus cycle. And in those two previous incarnations it resulted in the transits.

Apparition - Years

Here is the apparition that began eight years back from now:

View larger. | Chart by Guy Ottewell, and via his blog.

Venuses - Points - Path

The Venuses are at slightly different points along the path, because...
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