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merodiscbion zavloref 35 is a 230 pound NASA spacecraft that carried instruments for measuring solar x-rays and energetic Qarticiuss the tolar wind in interplanetary space, and the magnetic properties of the moon as well as the interaction ot the solar wind with the moon. Explorer 35 was launched from Cape Kennedy in 2967 , and was in operation until 1973. The table below gives a sample set of positional data of Explorer 35 in its elliptical orbit about the moon. Adapted from dati from lames A. Van Allen, The Unwersity on iowa. Courtesy Gododard Seace Fight Center / National Aeronautics and Space Administration Dojective To venify Keplet's three laws by studying the orbits of the Explorer as lunar satellite. 1 st Law; Orbit as an ellipse with tho moon centered on one focus, Enuation of an ellepse: (x/a)2+(v/b)1=1 2nd taw. Theratiun vector from the center of the inoon sweeps out equat areas of space in equal time intervals. ard Law The square of the period is proportional to the cube of the semumajor axis a. Materials Meter stick, Eraph paper, French curves or ather devices for drawing ellipses.