Editing Transit of Earth from Mars (section)

==Conjunctions==
Transits of Earth from Mars usually occur in pairs, with one following the other after 79 years; rarely, there are three in the series. The transits also follow a 284-year cycle, occurring at intervals of 100.5, 79, 25.5, and 79 years; a transit falling on a particular date is usually followed by another transit 284 years later. Transits occurring when Mars is at its [[ascending node]] take place in May, those at [[descending node]] happen in November. This cycle corresponds fairly closely to 151 Mars orbits, 284 Earth orbits, and 133 [[synodic period]]s, and is analogous to the cycle of [[transit of Venus|transits of Venus from Earth]], which follow a cycle of 243 years (121.5, 8, 105.5, 8). There are currently four such active series, containing from 8 to 25 transits. A new one is set to begin in 2394. The last series ending was in 1211.