The reconstructed geometry of the 2015 June 29 Pluto stellar occultation. Celestial north is at the top and celestial east to the left; see labels N and E. The equator and prime meridian (facing Charon) are drawn as thicker lines. The direction of planet rotation is along the gray arrow. In the two panels, the stellar motion relative to Pluto is shown as black solid lines as seen from the Bootes-3 and Dunedin stations, with direction of motion marked by the black arrow. The shaded region at the center roughly indicates the zone where a central flash could be detected. In the upper panel, the red and bluelines are the trajectories of the primary and secondary stellar images, respectively, as seen from Bootes-3. In the lower panel, the same is shown as in the upper panel but for the stellar images as seen from Dunedin. For a spherical atmosphere, the position of the star in the sky plane, the center of Pluto and the two images are aligned, as shown in the upper panel (see the dotted line connecting the star symbols).