StarDome is a Java applet simulating the night sky, initially displaying the view from Waukesha, Wisconsin, but customizable to any location using latitude, longitude, time zone, and daylight saving ...

THIS is a handy and lucid manual dealing with all the problems that arise in field work with a theodolite, namely, determinations of altitude, latitude, azimuth, time, and longitude. It contains a ...

AT 20 minutes to 6 P.M. on Saturday 10th inst., I witnessed a natural phenomenon which I understand is very unusual. It was a portion of a halo around the zenith. Take the zenith as centre, and with a ...