A full moon at perigee appears roughly 14% larger in diameter than at apogee. The argument of perigee is such that apogee occurs on or near the equator. TV-4 achieved a stable orbit with an apogee of and a perigee of . A single-impulse launch results in an elliptical orbit, with a high apogee and low perigee. Apollo 7 was placed in an Earth-orbit with an apogee of and perigee of . With this its apogee was raised to , and the perigee to . With this Chandrayaan-1's apogee was raised to , and its perigee to . So every 14 lunations there is a Full Moon nearest to perigee. It was the lowest ever perigee altitude flown by an orbiter. The term "perigee-syzygy" or "perigee full/new moon" is preferred in the scientific community. The actual data downlinks will occur every 13.7 days near perigee. The perigee was , and maximum velocity (at perigee) was . On-board satellite propulsion is then used to raise the perigee, circularise and reach GSO. On-board satellite propulsion is then used to raise the perigee, circularise and reach GEO. Tarcher merged with sister imprint Perigee to form TarcherPerigee in 2015.