AbstractThe article describes the construction of an oblique stereographic graticule on a transparent overlay for use with published star charts plotted on the polar stereographic projection. The planisphere presents, for every instant of any time system, a continuous display of the altitude, azimuth and hour angle of all stars shown on the star chart which are visible from the observer's latitude, and it can be used for both prediction and identification. A particularly useful feature is the facility for the instantaneous determination of elongation data.