Venus will reach perihelion – its closest point to the sun in its orbit – on November 29, 2015. Venus’ orbit is the closest to being circular of all the planets in our solar system. Its distance from the sun only varies by only about 1.5% between perihelion and aphelion (farthest point from the sun).
Venus is well known for its 8-year cycles. This planet – which orbits the sun one step inward from Earth – swings to perihelion 13 times every 8 years. So Venus’ 13th return to perihelion will happen some 8 years from now – on November 28, 2023 – with Venus and Spica returning to virtually the same spot in the November 2023 morning sky.
Venus returns to perihelion 13 times in 8 years:
1. 2016 July 10
2. 2017 Feb 20
3. 2017 Oct 3
4. 2018 May 16
5. 2018 Dec 26
6. 2019 Aug 8
7. 2020 Mar 20
8. 2020 Oct 30
9. 2021 Jun 12
10. 2022 Jan 23
11. 2022 Sep 4
12. 2023 Apr 17
13. 2023 Nov 28link: earthsky. org
E u p a t o r i u m L., named for Mithridates VI of Pontus (135–63 BC), also known as Eupator (出身高貴) Dionysius, who is said to have discovered an antidote to a commonly used poison in one of the species. C h r o m o l a e n a DC., the name is derived from the Greek chroma, color, and laina, cloak; refering to the colored phyllaries of some species.M i k a n i a Willd., the name honors the Czech botanist Johann Christian Mikan (1743-1814).
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