I'm sure there are others, but if you go to Heavens Above and either register for a (free) account or enter through one of their other "guest" options, from the main page, hit the Planet Summary Data link, and you will be presented with a table giving a great many current details about the planets, including Oppositions.
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"Earth diameter is 7,900 miles, and Moon diameter is 2,160 miles. It takes on average 90 minutes to complete one Earth orbit, so one Moon orbit should take roughly 25 minutes." - Sam "NasaScam" Colby
Bearer of the highly coveted "I found Venus in nine Apollo photos" sweatsocks.
DataCable^2008 A+
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