Re: How can I look up transits that already happened?
right. You want a timetable of planetary positions called an ephemeris. If you open the above site, just look for the year and month you want, then scroll down to the date.
astro.com also lets you cast a chart for any earlier dates you want.
"That which you have tried yourself, which you have experienced, which you have recognized as true, and which will be beneficial to you and to others; believe that, and shape your conduct to it." --Buddha, Kalama Sutta
"My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world." --Jack Layton, Canadian NDP leader, "Letter to Canadians," written two days before his death from cancer.