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Pages: 1 Edward E professor emeritus Reged: 03/26/06 Loc: Tucson, Arizona No Opposition for Jupiter in 2013       #5558976 - 12/07/12 10:17 AM Edit   Reply   Quote Quick Reply   I was looking at some tables for opposition times of Jupiter and Saturn from 2000 to 2020 when I noticed that there will be no opposition for Jupiter in 2013. How often does this quirk of celestial mechanics happen? Post Extras:       CPellier sage Reged: 08/07/10 Re: No Opposition for Jupiter in 2013 [Re: Edward E]       #5559194 - 12/07/12 12:14 PM Edit   Reply   Quote Quick Reply   It may/must (?) happens once per jovian year, when the opposition month shifts from december to january. Last time was in 2001 (opp. was on january 2, 2002) Post Extras:       Centaur Vendor Reged: 07/12/04 Loc: Chicago Re: No Opposition for Jupiter in 2013 [Re: Edward E]       #5561447 - 12/08/12 08:27 PM Edit   Reply   Quote Quick Reply   Quote: I was looking at some tables for opposition times of Jupiter and Saturn from 2000 to 2020 when I noticed that there will be no opposition for Jupiter in 2013. How often does this quirk of celestial mechanics happen? The mean synodic period for Jupiter is about 13.1 months, i.e. the time it takes for Earth to lap Jupiter in their race around the Sun. Therefore about every 12 years a December opposition is followed by a January opposition, meaning a calendar year gets skipped. In the case of Mars this “quirk” occurs more regularly as its mean synodic period is about 25.6 months. Therefore alternate calendar years are skipped and occasionally two of them. Post Extras:       PhilCo126 Carpal Tunnel Reged: 01/14/05 Loc: coastline of Belgium Re: No Opposition for Jupiter in 2013 [Re: Centaur]       #5569043 - 12/13/12 11:16 AM Edit   Reply   Quote Quick Reply   Oppositions every #... days: every 780 days for Mars every 399 days for Jupiter every 378 days for Saturn every 369 days for Uranus every 367 days for Neptune Refractor-Phill Post Extras:       Pages: 1

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