original: Such near-perihelion oppositions occur on a regular cycle every twenty-two years, with the last occurring in 1991 and the next in 2013.
simplifications: Such near-perihelion gathering happens every twenty-two years. Near-perihelion oppositions happen every twenty-two years, with the last in 1991 and the next in 2013. Such near-perihelion oppositions occur on a regular cycle every twenty-two years. The last two occurred in 1991 and 2013. These near-perihelion oppositions happen on a regular cycle every twenty-two years. The last was in 1991, and the next is in 2013. Such near-perihelion oppositions occur on a regular cycle every twenty-two years. The last was in 1991 and the next will be in 2013. Instances were a body comes very close to the sun happen around every 22 years. Near-perihelion oppositions happen on a cycle every twenty-two years. The last occurred in 1991 and the next in 2013. Such events where the orbit drifts closest to the sun occur on a regular cycle every twenty-two years. The last time this happened was in 1991 and the next will be in 2013. Such close orbits to the sun occur regularly every 22 years, last occurred in 1991 and will again in 2013. Such near-perihelion disparity happens on a regular cycle every twenty-two years, with the last happening in 1991 and the next in 2013.