This is a very interesting question. My friend upstairs excerpted the laws of Venus' motion (although it is very valuable, it is estimated that the landlord has understood these from the question). I believe the landlord can understand that how long it will take to see Venus is actually a highly subjective question. Let me talk about my own experience.

June 6th, 20 12, transit of venus is a celestial phenomenon that every celestial lover will never forget. In Tian Ai magazine in May of that year, the author of the astronomical forecast said: You fans can challenge when you see Venus for the last time before the next day.

20 12 is the graduation season of my university, so I have enough time to engage in my hobbies. This sentence, which I still remember, naturally became a relief from my life at that time.

As far as my personal observation results are concerned, the last time I saw Venus was on May 22nd, on the small bridge at the northeast intersection of Zhongshan North Road on Huangxing Road (there is an east-west river, so I have a good view to the west), and I saw Venus in the afterglow of sunset. Since then, the weather in Shanghai has deteriorated. After forgetting whether it was better on the 26th or 27th, I tried to find Venus in vain.

Therefore, it can be concluded that the observation conditions of Venus can still be found in the city 16 days before the conjunction of Venus. Until 10 days before Venus, the general attention in the city is hard to find, and the northwest must be extremely empty without cloud cover &; You can only see it in the case of strong light interference (the best place in Shanghai is the ferry).

Theoretically, Venus can be seen a few days before the conjunction, or it can be seen as the morning star after a similar time difference. However, in 20 12, I first saw the morning star in August 13. I believe the landlord also understands that this is when I observed the Perseid meteor shower and saw that Venus was the morning star. For the vast majority of enthusiasts, the key factor for how long you can see the morning star is not the observation conditions of celestial bodies, but whether you can stay up until dawn.

————————————— Supplementary answer ————————

Suddenly, I saw a river. I'm sorry I have no experience to share. After all, few people can get up before dawn every day to see Venus. However, from the experience of seeing Venus as a dark star after the conjunction, it is relatively easy to find Venus in the city about one and a half months after the conjunction.