Authentic Science Fiction Monthly, No. 66 — page 45: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

AUTHENTIC SCIENCE FICTION longitude. With these pro- jector arrays it is possible to demonstrate effects due to change of latitude, diurnal motion and precession of the equinoxes. During a demon- stration, of course, these ap- pearances can take place in a few minutes—the great pre- cessional cycle of 25,800 years, for example, can take place in the planetarium in just over a minute. From the above it can be seen that a planetarium is ar from the glorified magic 4itern which some people CaGgine it. Each instrument J@rtains almost six miles of spe. | 44 THREE OF THE SIXTEEN CONDENSER LENSES IN EACH STAR GLOBE wiring and thousands of parts» each fitted with meticulous accuracy. These parts are far from being delicate. This can be proved by the fact that, in the early days of the Zeiss Planetariums, it was the pleasant custom during the Christmas season at the Hay- den and other planetariums, to run back the annual motion for almost two thousand years so as to show the appearance of the sky at the time of the birth of Christ. This was an amazing demonstration of the versa- tility of the projector, for the run was made at a speed of comiclooks.com